eCommerce Glossary 2026: 250+ Online Retail Terms Defined

Online retail in 2026 sits at the intersection of at least eight distinct vocabularies — finance, platform engineering, catalog science, logistics, payments, lifecycle marketing, retail media, and emerging AI commerce. Operators who can move fluently between them write better briefs, hire better teams, and close cross-functional projects faster. This glossary consolidates 250+ terms we see most often in agency engagements across Shopify, BigCommerce, Adobe Commerce, and composable stacks. For a broader marketing reference, pair it with our 500-term digital marketing glossary.

How to use this glossary

Each section groups terms by the team that most often owns them — finance, platform, merchandising, operations, payments, lifecycle, retail media, and innovation. Treat it as a shared dictionary for cross-functional projects, vendor RFPs, and onboarding new eCommerce hires.

Revenue & Conversion Metrics

Unit economics are the grammar of eCommerce. Before discussing channels, creative, or merchandising, leadership teams align on the core finance and conversion metrics below. These definitions mirror how CFOs, growth leads, and analytics teams use them in board decks and weekly business reviews.

AOV (Average Order Value) — Total revenue divided by number of orders in a period. Baseline KPI for pricing, bundling, and upsell decisions.

LTV (Customer Lifetime Value) — Predicted gross profit from a customer across their entire relationship with the brand. Core input to acquisition budgets and payback modeling.

CAC (Customer Acquisition Cost) — Fully-loaded marketing spend divided by new customers acquired. The denominator in LTV:CAC ratios that dictate funding and scale.

ROAS (Return on Ad Spend) — Attributed revenue divided by ad spend for a specific channel or campaign. A tactical metric, not a profitability measure.

MER (Marketing Efficiency Ratio) — Total revenue divided by total marketing spend across all channels. Used to sanity-check platform-reported ROAS inflated by overlap.

nCAC (New Customer Acquisition Cost) — Marketing spend divided specifically by new (not returning) customers, isolating true acquisition economics.

Conversion Rate (CVR) — Orders divided by sessions. Segment by device, source, and landing page to diagnose store performance.

Add-to-Cart Rate — Percentage of sessions that include an add-to-cart event. Early signal of merchandising and PDP quality.

Cart Abandonment Rate — Share of carts that do not proceed to completed checkout. Benchmarks live in our cart abandonment statistics report.

Checkout Abandonment Rate — Share of shoppers who reach checkout but do not convert, isolating payment, shipping, and form friction.

Bounce Rate — Sessions with a single interaction before exit. Historically misleading in GA4; use engagement rate in parallel.

Engagement Rate — GA4-native metric capturing sessions with a conversion, 10+ seconds on site, or multi-page depth.

Session — A user's continuous interaction with the storefront, typically bounded by 30 minutes of inactivity.

Gross Merchandise Value (GMV) — Total sales volume processed before returns, discounts, or fees. Common at marketplaces; rarely a profit indicator.

Net Revenue — Gross sales minus returns, refunds, and promotional discounts. The line finance treats as reality.

Gross Margin — Net revenue minus COGS, expressed as a percentage. Sets the ceiling for how aggressively you can fund acquisition.

Contribution Margin — Gross margin minus variable marketing, payment, and fulfillment costs. The truest per-order profitability view.

Payback Period — Time required for a cohort's contribution margin to equal its CAC. A capital-efficiency metric investors care about.

Repeat Purchase Rate (RPR) — Percentage of customers who place at least a second order. Early proxy for product-market fit and LTV quality.

Purchase Frequency — Average number of orders per customer per period. Drives catalog breadth and replenishment strategy.

Cohort Analysis — Grouping customers by first-purchase month to track retention, LTV, and channel quality over time.

Attribution Window — Time range within which a touchpoint can claim credit for a conversion, e.g., 7-day click, 1-day view.

Multi-Touch Attribution (MTA) — Assigning fractional conversion credit to multiple touchpoints using rules or models.

Incrementality — Revenue a channel drives that would not have occurred without it, measured via holdout or geo tests.

Media Mix Modeling (MMM) — Statistical regression on aggregated sales and spend to attribute revenue to channels privacy-safely.

Funnel Drop-off — Percentage of users leaving between any two funnel steps; the basic CRO diagnostic.

AOV per Channel — Average order value sliced by traffic source. Reveals which channels attract bigger-basket shoppers.

Revenue per Visitor (RPV) — Total revenue divided by sessions. A blended single metric that combines CVR and AOV.

Discount Rate — Share of revenue given up as markdowns or promotions. Tracks promotional dependency.

Return Rate — Share of units or revenue returned. Category-dependent; apparel frequently exceeds 25%.

Stockout Rate — Percentage of sessions where at least one sought SKU is out of stock; a silent revenue killer.

Checkout Funnel — The ordered steps from cart to confirmation — typically cart, contact, shipping, payment, review.

Platforms & Infrastructure

The platform layer determines your speed limits — how quickly you can ship new features, localize markets, and orchestrate data across systems. Vocabulary here borrows from both retail and modern software architecture, and it is essential when scoping replatforms or building custom eCommerce solutions.

Headless Commerce — Decoupled architecture where the storefront (frontend) communicates with commerce back-ends via APIs, enabling flexible UI and omnichannel delivery.

Composable Commerce — Assembling best-of-breed services (cart, search, CMS, PIM) behind a common experience layer, rather than buying one suite.

MACH — Microservices, API-first, Cloud-native, Headless — the architectural philosophy under most composable stacks.

Monolithic Commerce — Traditional all-in-one platform where storefront, cart, admin, and catalog ship as a single tightly-coupled application.

PWA (Progressive Web App) — A web storefront that behaves like a native app — installable, offline-capable, and fast on unreliable networks.

Shopify — Hosted SaaS platform powering millions of merchants; see our Shopify statistics for share and growth data.

Shopify Plus — The enterprise tier with Shopify Functions, Launchpad, checkout extensibility, and wholesale channels.

BigCommerce — API-first SaaS platform popular with mid-market and B2B brands for its open architecture and multi-storefront support.

Adobe Commerce (Magento) — Enterprise platform with deep customization and B2B functionality, available self-hosted or on Adobe Commerce Cloud.

WooCommerce — Open-source WordPress plugin that powers a large share of small-to-mid catalog stores.

Salesforce Commerce Cloud — Enterprise cloud platform with deep integrations into Salesforce CRM, Marketing Cloud, and Service Cloud.

commercetools — Leading MACH-certified commerce back-end widely adopted by enterprise composable programs.

OMS (Order Management System) — System that orchestrates orders across warehouses, stores, and drop-ship partners, supporting split shipments and BOPIS.

PIM (Product Information Management) — Central store of product attributes, copy, images, and relationships syndicated to storefronts and marketplaces.

DAM (Digital Asset Management) — Repository for creative assets — photography, video, 3D — with permissioning, rights, and syndication metadata.

CDP (Customer Data Platform) — Unified, persistent customer profile store that stitches behavior across web, email, and transactions.

ERP (Enterprise Resource Planning) — System of record for finance, inventory, and procurement, typically integrated with commerce via middleware.

WMS (Warehouse Management System) — Software that manages receiving, put-away, picking, and packing within fulfillment centers.

CDN (Content Delivery Network) — Geographically distributed edge servers that cache and accelerate storefront assets, critical for Core Web Vitals.

Edge Rendering — Generating HTML at CDN edge nodes near the user to reduce TTFB and enable personalization at low latency.

Storefront API — The read/write API (often GraphQL) that powers headless and mobile storefronts against a commerce back-end.

Admin API — Back-office API for managing products, orders, and customers — used by operations tooling and integrations.

Checkout Extensibility — Platform hooks (e.g., Shopify Functions, checkout UI extensions) that let developers customize checkout without editing the core.

iPaaS (Integration Platform as a Service) — Middleware services — Celigo, Workato, MuleSoft — that connect commerce, ERP, OMS, and CRM.

Webhooks — Event-based HTTP callbacks (order created, refund issued) that drive near-real-time integrations.

Multi-Storefront — Running multiple branded storefronts — by region, brand, or B2B/B2C split — from a single platform instance.

Internationalization (i18n) — Adapting currency, language, tax, and content to local markets within a single or federated storefront.

Feature Flags — Toggles that enable or disable features per segment, cohort, or environment to decouple deploy from release.

Core Web Vitals — Google's user-experience metrics (LCP, INP, CLS) that influence search rankings and conversion for storefronts.

Time to First Byte (TTFB) — Milliseconds from request to the first byte returned; a primary backend performance signal for SEO.

Product Catalog & Merchandising

Catalog data is the fuel; merchandising is the engine tuning. The terminology below shows up in PIM specifications, search RFPs, and every serious category management conversation.

SKU (Stock Keeping Unit) — A unique internal identifier for each sellable variant — size, color, configuration — of a product.

UPC (Universal Product Code) — 12-digit barcode standard used predominantly in North American retail.

EAN (European Article Number) — 13-digit barcode standard common in Europe and increasingly global.

GTIN (Global Trade Item Number) — Umbrella identifier encompassing UPC, EAN, and ISBN — required for most marketplace and Shopping feeds.

ASIN — Amazon Standard Identification Number — Amazon's internal 10-character product ID.

Parent Product — The base product entity that groups multiple variants; often what shoppers see on a single PDP.

Variant — A specific sellable option of a parent product — e.g., "T-shirt in Black, Size M".

Attribute — A structured property of a product — color, material, warranty period — used in filtering, search, and feeds.

Taxonomy — The hierarchical category tree (department → category → subcategory) that organizes a catalog.

Collection / Category — A curated group of products — manual or rule-based — that renders as a PLP.

PDP (Product Detail Page) — The page that sells a single product, carrying imagery, copy, pricing, reviews, and the add-to-cart.

PLP (Product Listing Page) — Category or search-results page presenting multiple products with filters and sort.

Faceted Search — Filter UI on PLPs driven by structured attributes (price, brand, size), enabling rapid narrowing.

Search Relevance — How well on-site search returns products that match user intent — tuned via synonyms, ranking, and ML models.

Zero-Result Rate — Share of on-site searches returning no products. Above 5% typically indicates catalog or synonym gaps.

Synonyms — Search dictionary mappings (e.g., "couch" ↔ "sofa") that prevent query-to-catalog mismatch.

Merchandising Rules — Rules that boost, bury, or pin products on PLPs and search for business reasons (promotion, margin, inventory).

Personalization — Serving product and content variations based on segment, behavior, or ML predictions.

Recommendations Engine — ML system generating "you may also like," "frequently bought together," and post-purchase widgets.

A/B Testing — Comparing two variations of an experience to a control group to identify statistically reliable winners.

Multivariate Testing (MVT) — Testing multiple element combinations simultaneously — higher sample-size requirements than A/B.

Bandit Testing — Adaptive experimentation that shifts traffic toward winning variants in real time; ideal for short-lived campaigns.

Bundling — Grouping SKUs into a single offer with a package price or discount; lifts AOV and moves slow stock.

Upsell — Promoting a higher-value version of the product the shopper is viewing or has in cart.

Cross-sell — Promoting complementary products ("complete the look," "add batteries").

Dynamic Pricing — Automated price changes based on demand, inventory, competitor feeds, or customer segment.

MAP (Minimum Advertised Price) — The lowest price a retailer can publicly advertise a product for, set by the manufacturer.

Rich Product Content — Enhanced PDP modules — video, 3D, comparison charts, A+ content — that lift conversion and reduce returns.

Structured Data (Schema.org) — Markup that helps search engines and LLMs understand products, prices, and availability.

Visual Search — Search powered by image embeddings, letting users upload a photo to find visually similar products.

Semantic Search — Vector-based on-site search that understands intent beyond keyword matching (e.g., "gift for dad who grills").

Fulfillment & Logistics

Delivery promise windows are now a conversion lever on par with price. The operations vocabulary below underpins every meaningful conversation about shipping economics, returns, and omnichannel fulfillment.

3PL (Third-Party Logistics) — External provider that warehouses inventory, picks, packs, and ships orders on behalf of the brand.

4PL (Fourth-Party Logistics) — Supply-chain manager that orchestrates multiple 3PLs and carriers end-to-end for a brand.

FBA (Fulfilled by Amazon) — Amazon's program where sellers ship inventory to Amazon, which then stores, picks, and ships orders.

FBM (Fulfilled by Merchant) — Seller ships Amazon orders themselves, controlling inventory and costs but not Prime badging by default.

SFP (Seller Fulfilled Prime) — Self-fulfillment while meeting Amazon's Prime speed, accuracy, and weekend-delivery standards.

DTC (Direct-to-Consumer) — Selling directly through owned channels rather than through retailers or wholesalers.

B2B Commerce — Wholesale, distributor, and business-buyer eCommerce with contract pricing, quoting, and net terms.

Dropshipping — Retailer lists products and orders ship directly from a supplier's warehouse; inventory never touches the retailer.

BOPIS (Buy Online, Pick Up In Store) — Shopper orders online and collects in-store; reduces shipping costs and drives store traffic.

BORIS (Buy Online, Return In Store) — Shopper returns an online order at a physical location; lifts return-visit basket attach rates.

Click-and-Collect — Umbrella term for BOPIS and curbside pickup programs across grocery, apparel, and specialty retail.

Ship-from-Store — Using retail stores as micro-fulfillment nodes to ship online orders closer to the customer.

Distributed Inventory — Holding stock in multiple regional nodes to reduce zone-based shipping costs and delivery times.

Last Mile — The final leg of delivery from carrier hub to the customer's door — often the most expensive segment.

Reverse Logistics — The processes for returning, inspecting, restocking, refurbishing, or disposing of merchandise.

Returns Management — Software and workflows — Loop, Happy Returns — that digitize returns authorization, labeling, and refunds.

Restocking Fee — Charge applied to a return to offset handling costs; common in electronics and furniture.

Dim Weight — Dimensional weight — a shipping price based on box volume rather than actual weight.

Zone Skipping — Bulk-shipping method that bypasses carrier sortation zones to reduce transit time and cost.

Rate Shopping — Automatically comparing carrier quotes at label-generation time to select the cheapest service meeting SLA.

ETA (Estimated Time of Arrival) — Promised delivery date shown on PDP and checkout; accuracy materially affects conversion.

OTIF (On-Time In-Full) — Share of orders delivered on the promised date with all items — a core fulfillment quality metric.

Split Shipment — An order fulfilled from multiple warehouses in more than one package.

Backorder — Accepting orders for temporarily out-of-stock items that will ship upon replenishment.

Pre-Order — Selling a not-yet-released product, typically with a firm ship-by date.

Safety Stock — Inventory buffer held to absorb demand variability or supplier delays.

Inventory Turns — Number of times inventory sells and is replenished in a period — a working-capital efficiency signal.

Sell-Through Rate — Units sold divided by units received, per period. Used heavily in apparel and seasonal categories.

Pick-Pack-Ship — The three core warehouse operations that convert an inbound order into a shipped package.

Shipping Insurance — Carrier or third-party coverage for lost, damaged, or stolen shipments; often offered to shoppers at checkout.

Landed Cost — The total cost of delivering a product to the customer including product, shipping, duties, and taxes.

Payments & Checkout

Payments is where friction, fraud, and compliance collide. These terms appear in every checkout optimization project, PSP negotiation, and global expansion brief.

PSP (Payment Service Provider) — The service — Stripe, Adyen, Braintree — that processes card and wallet transactions on behalf of the merchant.

Stripe — Developer-first payments platform with a broad suite including Billing, Radar, Terminal, and Issuing.

PayPal — Consumer wallet and PSP widely used as an alternative payment method at checkout.

Adyen — Unified commerce payments platform favored by global enterprises for in-store plus online acceptance.

Acquirer — The bank that processes card transactions on the merchant's behalf and settles funds.

Issuer — The cardholder's bank that authorizes or declines transactions.

Authorization — Real-time reservation of funds on a card; becomes a capture when the merchant settles the sale.

Capture — Actual movement of the authorized amount from the customer's account to the merchant.

Auth Rate — Percentage of card attempts approved by issuers. Sub-90% is a red flag on legitimate traffic.

Decline Recovery — Retry logic — dunning, smart retries, account updater — that recaptures failed transactions.

Chargeback — Forced refund initiated by the cardholder's bank, often due to fraud or dissatisfaction claims.

Chargeback Rate — Chargebacks divided by transactions; exceeding ~1% triggers monitoring programs with card networks.

3DS (3-D Secure) — Authentication layer (Verified by Visa, SecureCode) that shifts fraud liability from merchant to issuer.

PCI DSS — Payment Card Industry Data Security Standard — compliance framework for storing or processing cardholder data.

Tokenization — Replacing card numbers with opaque tokens, reducing PCI scope and enabling one-click reuse.

Apple Pay — Apple's device-level wallet offering tokenized, biometric-authenticated express checkout.

Google Pay — Google's equivalent wallet, widely supported across Chrome and Android devices.

Shop Pay — Shopify's accelerated checkout, storing buyer profiles across Shopify-powered stores for one-tap purchase.

BNPL (Buy Now, Pay Later) — Installment payment option — Klarna, Afterpay, Affirm — offered at checkout to smooth AOV pressure.

Subscription Billing — Recurring charges managed by platforms like Recharge or Stripe Billing — core to replenishment and membership models.

Dunning — Automated email and retry sequences for failed subscription payments to reduce involuntary churn.

Crypto Payments — Accepting BTC, ETH, or stablecoins via gateways like Coinbase Commerce; typically settled to fiat in real time.

Alternative Payment Methods (APMs) — Non-card methods — iDEAL, Sofort, UPI, Pix — essential for conversion in specific local markets.

Express Checkout — Single-step flows — Shop Pay, PayPal, wallets — that skip manual shipping and payment input.

Guest Checkout — Completing a purchase without creating an account; typically lifts conversion but weakens retention data.

Address Validation — Services that standardize, verify, and autocomplete shipping addresses to reduce misdeliveries.

Tax Automation — Services like Avalara or TaxJar that calculate jurisdiction-accurate sales tax and VAT at checkout.

Fraud Scoring — Real-time risk model output — Stripe Radar, Signifyd, Kount — that approves, reviews, or blocks orders.

Chargeback Representment — Merchant process of disputing a chargeback with evidence to recover the funds.

Strong Customer Authentication (SCA) — EU regulatory requirement (PSD2) for two-factor authentication on most online card transactions.

Marketing & Retention

Acquisition wins the first order; retention wins the business. The terms below describe how modern brands convert that first transaction into a relationship — paired well with our content marketing services.

Retargeting — Serving ads to users who previously visited the site, typically via Meta, Google, and programmatic networks.

Prospecting — Ads aimed at shoppers unfamiliar with the brand — the counterpart to retargeting.

Lookalike Audience — Audience built from users resembling an existing seed list on a given ad platform.

RFM (Recency, Frequency, Monetary) — Customer scoring model combining last-order recency, order frequency, and spend to drive segmentation.

Abandoned Cart Flow — Triggered email/SMS sequence recovering carts left unchecked — typically 1–3 messages over 24–72 hours.

Browse Abandonment — Similar sequence triggered when a shopper viewed products but did not add to cart.

Post-Purchase Flow — Order confirmation, shipping, review request, replenishment, and loyalty enrollment emails after a purchase.

Winback Flow — Automated sequence re-engaging customers who have not purchased for a defined lapsed period.

Replenishment Flow — Reminders timed to a consumable's predicted run-out date; standard in beauty, supplements, and pets.

Loyalty Program — Points, tiers, and rewards that encourage repeat purchase — Smile, Yotpo, LoyaltyLion are common platforms.

VIP Tier — Top loyalty tier with elevated benefits — early access, free shipping, dedicated support — typically generating outsized LTV.

Subscription Commerce — Recurring-delivery business models — subscribe-and-save, membership, curated boxes.

Email Automation — Behavior-triggered email flows managed in tools like Klaviyo, Omnisend, or Bloomreach Engagement.

SMS Marketing — Permission-based text marketing — Attentive, Postscript — achieving high open rates and strong transactional lift.

Double Opt-In — Requiring a confirmation click after form submission to validate consent and improve list quality.

Deliverability — Share of sent emails that reach the inbox — driven by authentication, reputation, and engagement.

Sender Reputation — Score mailbox providers assign to a sending domain/IP based on engagement, complaints, and bounce behavior.

Referral Program — Structured "give $X / get $X" mechanics powered by tools like Friendbuy or ReferralCandy.

Affiliate Program — Third-party publishers earn commission for driving sales via tracked links — managed via Impact, PartnerStack, Refersion.

Influencer Marketing — Paying or gifting creators to promote products to their audience, often measured via promo codes or UTMs.

User-Generated Content (UGC) — Customer-created photos, videos, and reviews used in ads, PDPs, and email, with rights granted.

Review Solicitation — Post-purchase requests — often via Yotpo, Okendo, or Stamped — to collect authentic reviews and ratings.

NPS (Net Promoter Score) — Single-question survey asking likelihood to recommend, used as a directional loyalty metric.

CSAT (Customer Satisfaction) — Short post-interaction survey measuring satisfaction with a specific transaction or touchpoint.

CES (Customer Effort Score) — Survey measuring how easy it was to resolve an issue or complete a task — strong predictor of retention.

Churn Rate — Percentage of subscribers or customers who cease purchasing in a given period.

Involuntary Churn — Churn caused by failed payments rather than active cancellation — typically recoverable with dunning.

Contribution per Subscriber — Monthly contribution margin per active subscriber — the core health metric for subscription brands.

Zero-Party Data — Preference and intent data shoppers proactively share via quizzes, preference centers, and surveys.

First-Party Data — Behavioral and transactional data the brand collects directly from its own channels.

Customer Segment — A targeted group defined by attributes, behavior, or predicted value — the unit of personalization.

Retail Media & Advertising

Retail media networks — Amazon, Walmart, Target, Kroger — are the fastest-growing ad category in eCommerce. Their vocabulary blends programmatic advertising with traditional shelf merchandising and requires fluency from any growth team selling through retail.

Retail Media Network (RMN) — A retailer's advertising platform selling placements on its properties and, often, across the wider web.

Amazon Ads — Umbrella for Amazon's ad products — Sponsored Products, Sponsored Brands, Sponsored Display, DSP, Streaming TV.

Sponsored Products — Keyword- or ASIN-targeted ads appearing within search results and PDPs, charged CPC.

Sponsored Brands — Banner-style ads featuring a brand logo, custom headline, and multiple products above search results.

Sponsored Display — Audience- and product-targeted display ads appearing on and off Amazon.

Walmart Connect — Walmart's retail media platform covering on-site search, display, and off-site programmatic.

Target Roundel — Target's retail media network with on-site, off-site, and in-store screen inventory.

Kroger Precision Marketing — Kroger's RMN offering targeting using loyalty card purchase data — strong in CPG.

Shelf Placement — Organic or paid position on a retailer's digital shelf — PLP, search results, category pages.

Share of Voice (SOV) — Percentage of high-visibility ad impressions a brand wins for a keyword or category.

Share of Shelf (SOS) — Percentage of visible organic slots a brand occupies on a retailer's category or search results.

CPC (Cost per Click) — Cost charged each time a shopper clicks an ad — primary pricing unit for Sponsored Products.

CPM (Cost per Mille) — Cost per thousand impressions — typical for display and Sponsored Brands awareness buys.

CPA (Cost per Acquisition) — Cost per conversion, typically a purchase — the outcome metric RMN buyers optimize toward.

ACOS (Advertising Cost of Sale) — Amazon-specific metric — ad spend divided by attributed sales, the inverse of ROAS.

TACOS (Total ACOS) — Ad spend divided by total (organic plus paid) sales, revealing ad dependency across the catalog.

New-to-Brand (NTB) — Amazon metric indicating purchases by shoppers who have not bought from the brand in the trailing year.

Buy Box — The featured-offer position on an Amazon PDP where the add-to-cart button routes; won via price, fulfillment, and seller metrics.

Brand Store — A retailer-hosted multi-page brand microsite — Amazon Stores, Walmart Brand Shops — used as a Sponsored Brands destination.

A+ Content / Enhanced Brand Content — Rich PDP modules — comparison charts, lifestyle imagery — that lift conversion on marketplace listings.

DSP (Demand-Side Platform) — Programmatic buying platform — Amazon DSP, The Trade Desk — that targets audiences across the open web, CTV, and streaming.

SSP (Supply-Side Platform) — Publisher-side technology that lists ad inventory for programmatic auctions.

CTV (Connected TV) — Streaming video ad inventory delivered via smart TVs and streaming sticks — increasingly sold by RMNs.

Endemic Advertising — Ads for products natively sold on the retailer running the RMN — e.g., CPG brands on Kroger.

Non-Endemic Advertising — Ads from brands that do not sell on the retailer but want access to its audience data (e.g., auto, travel).

Clean Room — Secure environment where retailers and advertisers analyze matched first-party data without sharing raw PII.

Closed-Loop Measurement — Connecting ad exposure directly to in-retailer sales — the measurement promise of RMNs.

Retail Search — Paid and organic search on retailer sites — increasingly where product research begins, not Google.

Digital Shelf Analytics — Monitoring tools — Profitero, Salsify, Jungle Scout — tracking availability, ranking, content, and pricing on retailer sites.

Joint Business Plan (JBP) — Formal annual plan between a brand and retailer covering assortment, promotion, shopper marketing, and RMN investment.

Emerging 2026 Commerce

A new layer of vocabulary has stabilized across 2025 and 2026 as AI agents, live video, and ambient interfaces reshape how shoppers discover and transact. For broader market context, see our eCommerce statistics 2026 report.

Agentic Shopping — AI agents that research, compare, and transact on behalf of shoppers — changing how brands compete for consideration.

Agent-Readable Catalog — Product data structured and licensed for consumption by AI shopping agents — beyond traditional SEO feeds.

LLM Commerce Protocols — Emerging standards (MCP, A2A, shopping APIs) that let AI models query and purchase from catalogs natively.

AI Merchandising — ML-driven ranking, bundling, and personalization that replaces much of the manual merchandiser workload.

Generative Product Imagery — Diffusion-model-generated product and lifestyle imagery — cutting photography costs while requiring governance.

Virtual Try-On — AR or generative try-on experiences for apparel, beauty, eyewear, and accessories to reduce returns.

3D Product Configurator — Interactive 3D PDPs letting shoppers rotate, customize, and visualize products in AR contexts.

Live Commerce — Real-time shoppable video streams — hosted, influencer-led, or branded — combining entertainment and checkout.

Shoppable Video — On-demand video with clickable product hotspots and in-player checkout.

Social Commerce — Native checkout on social platforms — TikTok Shop, Instagram Shopping, Facebook Shops, YouTube Shopping.

TikTok Shop — Native in-app marketplace with live and short-form commerce, dramatically shifting DTC creative strategy.

Creator Commerce — Shopping experiences anchored to an individual creator's storefront, catalog, or livestream channel.

Ambient Commerce — Purchases initiated from smart home devices, vehicles, wearables, or embedded screens — often invisible to the shopper.

Voice Commerce — Purchases transacted via voice — Alexa, Google Assistant, in-vehicle assistants — increasingly tied to AI agents.

Conversational Commerce — Chat-based shopping across WhatsApp, Messenger, SMS, and LLM chatbots with native checkout.

Unified Commerce — Single source of truth for inventory, pricing, and customer identity across online, store, mobile, and marketplace channels.

Phygital — Experiences blending physical retail with digital interactivity — QR, AR mirrors, connected fitting rooms.

Resale / Recommerce — Brand-operated or platform-powered second-hand selling programs — trade-in, rental, refurbished channels.

Circular Economy — Business models designed around reuse and resale rather than single-use consumption.

Carbon-Neutral Shipping — Offsetting or avoiding shipment-related emissions, often communicated at checkout as a conversion lever.

Digital Product Passport — EU-driven standard for digitally tracking a product's materials, origin, and repairability throughout its life.

Checkout-Free Stores — Physical stores using computer vision and sensors to auto-charge shoppers at exit without a traditional checkout.

Headless Frontends with AI SDKs — Storefronts built to surface generative search, chat, and recommendation APIs as first-class experiences.

Retrieval-Augmented Commerce — RAG-style architectures grounding shopping chatbots in live catalog, inventory, and pricing data.

Synthetic Customer Research — LLM-driven simulation of segment reactions to creative and merchandising concepts — complement, not replacement, for real research.

Embeddings-Based Personalization — Using vector representations of products and shoppers to drive recommendations beyond rules and collaborative filtering.

AI-Generated PDP Copy — Programmatic product descriptions tailored to SKU attributes, segment, locale, and SEO targets — with editorial review workflows.

Multimodal Search — Search combining text, image, and voice inputs — common in both on-site and cross-site agent experiences.

Zero-UI Commerce — Purchase flows with minimal or no graphical interface — ambient, voice, or agent-driven.

Agent Attribution — Evolving standards for crediting AI agents with referred conversions — essential as agent-driven traffic scales.

Glossary governance

Terminology drifts faster than documentation. We recommend reviewing your internal commerce glossary quarterly — especially agent, RMN, and composable sections — and codifying preferred definitions in your PIM, analytics spec, and onboarding materials so teams share a single vocabulary.

Conclusion

eCommerce in 2026 is no longer a single discipline — it is eight overlapping ones. A shared glossary is the minimum viable infrastructure for running cross-functional initiatives, writing precise RFPs, and onboarding new team members quickly. Use this document as a starting point, tailor definitions to your operating model, and revisit the retail media and agentic sections most often: they are evolving the fastest.

For deeper dives, pair this glossary with our eCommerce statistics 2026 report, Shopify platform growth data, and cart abandonment benchmarks.