Key takeaways
- This glossary covers the 30+ terms a Shopify operator actually encounters - storefront, theme, marketing, analytics, fulfilment.
- Each entry has a deep-link anchor so you can share a definition directly.
- Terms marked with a star are ones we see misused most often.
- If a term is missing that you’d find useful, let us know - we treat this as a living page.
A short, plain-language glossary of the terms that come up when you operate a Shopify store. Definitions are written for an operator (founder, marketer, ecommerce manager), not a developer.
Why you can trust us
We have 15+ years building for the web, four years deep in Shopify specifically, and have built Fudge - which means we read Shopify’s internals every day. Where Shopify’s terminology has changed (Online Store 2.0, Hydrogen, Markets), we use the current names.
Storefront and theme terms
Add to Cart (ATC)
The action of putting a product into the cart. The ATC rate is the percentage of sessions where the customer clicked Add to Cart, divided by total sessions. A core CRO metric. See our Shopify CRO guide.
Average Order Value (AOV)
Revenue / orders. The average a customer spends per order. Lifted by bundles, free-shipping thresholds, cross-sells, post-purchase upsells.
Buy Box
The block on a product page containing price, variant selectors, and the Add to Cart button. Usually the highest-converting region of the PDP. See anatomy of a high-converting product page.
Cart Drawer
A side panel that opens when an item is added to cart, rather than a full-page cart redirect. Retains browsing context and supports inline upsells.
Checkout Extensibility
Shopify Plus’s modern checkout customisation framework. Replaces the legacy checkout.liquid approach with app-extension UI that works inside one-page checkout.
Conversion Rate (CR)
Orders / sessions. The headline storefront performance metric. Benchmarks vary widely by category and traffic source. See Shopify conversion rate benchmarks.
Hero Section
The first visible section of a page, usually a large image + headline + CTA. Owns the “what is this site / product?” first impression.
Hydrogen
Shopify’s React-based headless storefront framework. Used for custom storefronts that decouple the frontend from Shopify’s default theme system.
Landing Page
A page built for a specific purpose - usually an ad campaign or product launch - with focused content and a single primary CTA. Different from a product page in that it’s typically not tied to a single SKU.
Liquid
Shopify’s templating language. Used to insert live content (product data, cart data, customer data) into theme HTML. If you’ve seen double curly braces around a product title in a theme file (the Liquid output tag), that’s Liquid.
Markets
Shopify’s framework for managing multi-region storefronts - currencies, languages, domains, product availability per region. See how to launch a Shopify store in Germany.
Metafields
Custom fields attached to Shopify resources (products, collections, customers, orders, pages). Used to extend the default Shopify data model with brand-specific attributes.
Online Store 2.0 (OS 2.0)
The modern theme architecture introduced in 2021. Adds section-based layouts to every page type (not just the homepage), JSON templates, app blocks, and metafield-driven content.
Page Builder
An app or AI tool that lets non-developers build custom Shopify pages without writing Liquid or HTML. See what is a Shopify page builder.
Product Detail Page (PDP)
The page for a single product. Includes the buy box, gallery, description, reviews, related products. The highest-impact page for most CRO work.
Section
A reusable block of a Shopify theme - hero, image grid, product list, FAQ. Sections can be added, removed, and reordered through the theme editor.
Storefront API
Shopify’s API for reading storefront data (products, collections, cart, checkout) for use in custom or headless storefronts.
Theme
The collection of Liquid templates, sections, snippets, CSS, and JavaScript that defines a Shopify store’s appearance. Free themes (Dawn, Sense, Craft) ship from Shopify; paid themes come from the Theme Store or developers.
Theme Editor
The native Shopify drag-and-drop editor for adding, removing, and configuring sections on a page. Not to be confused with a page builder, which extends beyond the theme editor’s capability.
Marketing and analytics terms
Attribution
Assigning credit for a sale to one or more marketing touchpoints. Last-click, first-click, and multi-touch are the common models. iOS privacy changes have made attribution noisier post-2021.
Click-Through Rate (CTR)
Clicks / impressions. Used for ads, email, search results. Not a Shopify-specific term but central to ecommerce marketing.
Customer Acquisition Cost (CAC)
Total marketing spend / new customers acquired. Compared to Customer Lifetime Value to judge unit economics.
Customer Lifetime Value (LTV)
Total revenue (or contribution margin) from a customer over their relationship with the store. The denominator that makes CAC interpretable.
Cumulative Layout Shift (CLS)
A Core Web Vital. Measures unexpected layout shifts during page load. Targets: under 0.1.
First Input Delay (FID) / Interaction to Next Paint (INP)
Core Web Vital measuring interactivity. INP replaced FID in 2024. Target: under 200ms.
Largest Contentful Paint (LCP)
Core Web Vital measuring when the main content of a page has loaded. Target: under 2.5s.
Return on Ad Spend (ROAS)
Ad revenue / ad spend. Different from ROI in that ROAS uses revenue, not profit. Common in DTC reporting.
Sessions
A visit to the store. The denominator in conversion rate. One person visiting twice in a day is two sessions in most analytics tools.
Universal Commerce Protocol (UCP)
Shopify’s open framework for AI shopping agents to interact with storefronts. See our Shopify UCP readiness breakdown.
Fulfilment and operations terms
Bundle
A grouped offering of multiple SKUs at a combined price. Native bundles became a Shopify feature in 2024; previously done through apps.
Drop Shipping
A fulfilment model where the store doesn’t hold inventory - orders pass through to a supplier who ships direct. Lower capital requirement; lower margin and brand control.
Print on Demand (POD)
A drop-shipping variant where products are manufactured per order (printed t-shirts, mugs). Apps: Printful, Printify. See print-on-demand on Shopify guide.
SKU (Stock Keeping Unit)
A unique identifier for a specific variant. A t-shirt in three sizes and two colours is six SKUs.
Subscription
Recurring purchases on a defined cadence. Apps: Recharge, Loop, Bold, native Shopify Subscriptions. Strong fit for consumables.
Wholesale / B2B
A separate purchase channel for business customers, usually with different pricing, payment terms, and order minimums. Shopify Plus includes native B2B; lower tiers use apps. See Shopify Plus wholesale setup.
AI and modern commerce terms
Agentic Storefront
A storefront designed to be acted on by AI agents - both the merchant’s AI tools (like Fudge) and the customer’s AI shopping agents. See the agentic storefront.
AI Page Builder
A page builder where pages are generated from prompts rather than dragged-and-dropped. See best AI page builders for Shopify and AI vs drag-and-drop.
Headless Commerce
A storefront architecture where the frontend and backend are separated. The frontend (usually built in React, Vue, or Hydrogen) calls Shopify APIs. Trade-off: more flexibility, more engineering.
Storefront Editor
A tool for editing not just pages but the broader storefront - sections, product pages, blogs, navigation. Broader scope than a page builder. See Shopify store editor.
If a term you needed isn’t here, drop us a note and we’ll add it.
FAQ
What’s the difference between a page builder and the Shopify theme editor?
The theme editor handles sections that ship with your theme. A page builder extends beyond - custom landing pages, layouts the theme didn’t anticipate, quiz pages, bundle pages. See what is a Shopify page builder.
What does Online Store 2.0 mean for my store?
OS 2.0 is the modern theme architecture from 2021 onwards. If your theme is OS 2.0, you can use sections on every page type (not just the homepage), JSON templates, app blocks, and metafield-driven content. Themes pre-2021 are OS 1.0 and have these capabilities only on the homepage.
Is Hydrogen worth it for my store?
Only if you need the flexibility of a custom React-based storefront and have the engineering bandwidth. For most Shopify stores, the standard theme architecture is faster to operate and easier to maintain.
What’s the difference between conversion rate and add-to-cart rate?
Add-to-cart rate is the share of sessions where the customer clicked Add to Cart. Conversion rate is the share of sessions that result in a completed order. ATC is upstream; CR is the end.
How is LTV calculated?
Total revenue (or contribution margin) from a customer over their relationship with the store. A common simple formula: average order value × orders per year × average customer lifetime in years.
