Shopify glossary for merchantsShopifyglossaryfor merchants

A 3PL, or third-party logistics provider, is an outsourced warehouse that stores your inventory and ships orders on your behalf. It removes the fixed cost of running a warehouse and usually improves delivery times through multiple locations. The integration matters as much as the rates: inventory and fulfillment status must sync back to Shopify reliably, or oversells follow.

A/B testing is showing two versions of a page or flow to comparable groups of visitors and measuring which converts better. It replaces opinion with evidence, but only when the test reaches statistical significance — most ecommerce tests need thousands of sessions per variant. Underpowered tests on low-traffic stores produce confident-looking noise.

The Admin API is Shopify's privileged GraphQL API for reading and writing store data — creating products, fulfilling orders, editing inventory. Unlike the Storefront API it must never be called from a browser, because its tokens can mutate the store. Apps, integrations, and back-office automations run against it, subject to rate limits that scale with plan.

AI Overviews are the AI-generated summaries Google places above traditional results, synthesised from several sources and citing them. They absorb a large share of informational clicks, which changes the goal of content: being cited in the summary now matters more than ranking beneath it. Pages win citations by answering a question directly, in a self-contained passage, near the top.

AOV, or average order value, is the average amount a customer spends per order — total revenue divided by number of orders over the same period. It is one of the three levers on ecommerce revenue, alongside traffic and conversion rate. Raising AOV through bundling, upsells, or free-shipping thresholds is usually cheaper than buying more traffic.

An API integration connects Shopify to another system — an ERP, a 3PL, a CRM — so data flows between them without manual re-entry. Direction and authority matter more than the plumbing: deciding which system owns inventory, and which merely reflects it, prevents the two from overwriting each other. Most integration bugs are ownership bugs, not transport bugs.

CAC, or customer acquisition cost, is the total sales and marketing spend needed to win one new customer. It is read against LTV: a business whose CAC approaches its LTV is buying revenue at a loss. Rising ad costs are the main reason merchants invest in organic channels such as SEO, where the cost per customer falls over time instead of rising.

A canonical tag tells search engines which URL is the authoritative version of a page when several URLs serve similar content. Shopify generates duplicates constantly — the same product reachable under multiple collection paths, plus tag and sort parameters — so canonicals are what consolidate ranking signals instead of splitting them. Google treats them as a strong hint, not a command.

Cart abandonment is when a shopper adds items to a cart and leaves without buying. Roughly 70% of carts are abandoned. The dominant causes are measurable and fixable: unexpected shipping cost, forced account creation, a slow or long checkout, and missing payment methods. Recovery emails claw back a share, but reducing the abandonment itself pays better.

Checkout is the flow from cart to completed order — contact details, shipping, payment, confirmation. On Shopify it is hosted and optimised by Shopify itself, which is why it converts well and why customisation is deliberately constrained to Checkout Extensibility. Shop Pay's accelerated checkout is measurably faster than a standard guest flow.

Checkout Extensibility is Shopify's supported way of customising checkout, replacing the old `checkout.liquid` file that reached end of life in 2024. Customisation now happens through checkout UI extensions, Shopify Functions, and branding APIs, all of which survive Shopify's own checkout upgrades. The trade-off is a fixed set of extension points instead of arbitrary code.

Churn rate is the share of customers or subscribers who stop buying over a given period. It is the mirror of retention and the single biggest input into LTV for a subscription business — a subscription with 10% monthly churn keeps the average customer for ten months. Voluntary churn is a product problem; involuntary churn (failed payments) is usually a solvable technical one.

CLS, or Cumulative Layout Shift, measures how much a page's content jumps around while it loads. The "good" threshold is a score below 0.1. It is caused by images and ad slots without reserved dimensions, late-injected banners, and web fonts that resize text on swap — and it is the vital most directly responsible for mis-taps at checkout.

Conversion rate is the share of sessions that end in a purchase — orders divided by sessions. Across ecommerce it typically sits between 1% and 3%, though it varies sharply by traffic source, device, and category. Because it multiplies against all traffic, a move from 1.8% to 2.2% is worth more than most acquisition campaigns.

Core Web Vitals are the three metrics Google uses to score real-world page experience: LCP for loading, INP for responsiveness, and CLS for visual stability. They are measured from actual Chrome users, not a lab test, and a page passes only if 75% of visits are within the "good" threshold on all three. They are a genuine — if modest — ranking signal, and a large conversion one.

Crawl budget is the number of URLs a search engine will crawl on your site in a given period, set by your site's authority and how fast your server responds. It only becomes a real constraint on large sites — but a Shopify store with unmanaged faceted URLs reaches that scale quickly, and spends its budget on filter permutations instead of products.

Cross-selling is recommending complementary products alongside the one a shopper is buying — the case with the phone, the belt with the trousers. Where upselling trades up on the same item, cross-selling adds a second item. Both raise AOV, and both work best when the recommendation is genuinely relevant rather than merely popular.

Data migration is transferring products, variants, collections, customers, orders, and content from the old platform into Shopify. Products are the easy part; the traps are variant models that do not map, historical orders needed for LTV and returns, and customer passwords, which cannot be migrated — customers must reset them. Every migration should be run twice: once into staging, once for real.

DTC, or direct-to-consumer, is a model in which a brand sells straight to shoppers through its own channels instead of through retailers or wholesalers. It gives the brand the margin, the customer data, and the relationship — and hands it the full cost of acquisition, service, and logistics in exchange. Shopify is the platform most DTC brands are built on.

E-E-A-T stands for experience, expertise, authoritativeness, and trustworthiness — the framework Google's human quality raters use to judge content. It is not a direct ranking factor but a description of what Google's algorithms try to approximate. For ecommerce it cashes out as real author bylines, genuine reviews, clear returns and contact information, and claims that other credible sites corroborate.

ERP integration connects Shopify to the system a business runs its operations on — NetSuite, SAP, Business Central — so products, inventory, orders, and invoices stay in sync. The ERP is normally the system of record for stock and pricing, and Shopify the sales channel that reflects it. Getting the sync direction and cadence right is what prevents overselling.

Faceted navigation is the filtering and sorting UI on a collection page — by size, colour, price, brand. It is excellent for shoppers and hazardous for SEO: each combination of filters can generate a crawlable URL, and a handful of facets can multiply into thousands of near-duplicate pages that drain crawl budget. The fix is deciding deliberately which facets are indexable and blocking the rest.

Fulfillment is everything that happens after the order is placed: picking, packing, shipping, tracking, and handling returns. It is where most of a store's post-purchase customer experience actually lives, and where margin quietly leaks. Shopify models it through fulfillment orders and locations, which is what lets a store split one order across warehouses.

GEO, or generative engine optimization, is the practice of making content citable by AI search engines — Google's AI Overviews, ChatGPT, Perplexity — rather than merely rankable in a list of blue links. In practice it rewards clear entity definitions, self-contained answers, structured data, factual precision, and third-party corroboration of the claims you make about yourself.

GMV, or gross merchandise value, is the total value of goods sold through a store over a period, before deducting discounts, returns, refunds, or fees. It measures the scale of a marketplace or store rather than its profitability, which is why it is quoted often and should be read carefully — net revenue can be far lower.

Headless commerce is an architecture that decouples the storefront a shopper sees from the commerce engine behind it, connecting the two over an API. On Shopify that means building the frontend in a framework such as Next.js or Hydrogen and calling the Storefront API, instead of rendering Liquid themes. It buys design and performance freedom at the cost of a system you must now build and maintain yourself.

hreflang is the annotation that tells search engines which language and region each version of a page is meant for, so a Canadian shopper gets the Canadian page rather than the UK one. It must be reciprocal — every version has to point back at every other, including itself — which is why it is so frequently implemented incorrectly. Shopify Markets emits it automatically for translated markets.

Hydrogen is Shopify's React framework for building headless (custom) storefronts. Built on Remix, it ships commerce-specific primitives — cart, product, and analytics hooks, plus Storefront API clients — so teams do not rebuild them. Hydrogen storefronts are typically deployed to Oxygen, Shopify's hosting, at no extra cost.

INP, or Interaction to Next Paint, measures how quickly a page visibly responds to a user's taps, clicks, and key presses across the whole visit — it replaced First Input Delay as a Core Web Vital in March 2024. The "good" threshold is 200 milliseconds. Poor INP is nearly always caused by too much JavaScript on the main thread, which on Shopify usually means too many apps.

Internal linking is how pages on your own site link to each other. It does two jobs: it distributes ranking signals from strong pages to the ones that need them, and it tells search engines which pages you consider important and how they relate. A product three clicks from the homepage with no contextual links pointing at it will struggle regardless of how good its content is.

Keyword cannibalization is when several pages on the same site compete for the same query, so search engines split signals between them and rank none of them well. It is common on ecommerce sites where a collection, a product, and a blog post all target the same phrase. The fix is consolidation — merge, redirect, or deliberately differentiate the intent each page serves.

Klaviyo is the email and SMS marketing platform most Shopify merchants use. Its value is the depth of its Shopify integration: it syncs order and browsing history, which is what makes abandoned-cart, win-back, and post-purchase flows target the right people. Those automated flows, not campaigns, are where nearly all of its revenue contribution comes from.

LCP, or Largest Contentful Paint, measures how long it takes for the biggest visible element — usually a hero image or heading — to render. Google's "good" threshold is 2.5 seconds. On Shopify the usual culprits are unoptimised hero images, render-blocking app scripts, and fonts, in that order.

Liquid is the open-source template language Shopify uses to render storefronts. It sits between your theme files and store data, exposing objects such as `product` and `cart` through tags, filters, and objects that are evaluated server-side. Liquid is intentionally sandboxed — it cannot make network calls or run arbitrary code — which is why heavier logic belongs in an app or a Shopify Function.

Local SEO is optimising to appear in geographically-qualified searches and in Google's map pack. It turns on a different set of signals than classic SEO: a complete Google Business Profile, consistent name-address-phone data across directories, review volume and recency, and proximity to the searcher. It matters to any merchant with a physical presence or a defined service area.

LTV, or customer lifetime value, is the total profit a business expects from one customer across the whole relationship. It is what justifies acquisition spend: if LTV is $180 and it costs $60 to acquire a customer, the ratio of 3:1 is generally considered healthy. LTV rises with repeat purchase rate, AOV, and margin, and falls with churn.

Magento to Shopify migration is the move from a self-hosted Adobe Commerce (Magento) store to Shopify. Merchants make it to escape the hosting, patching, and developer cost that Magento carries, trading deep configurability for a managed platform. The hard parts are complex attribute sets, customer password hashes that cannot be transferred, and Magento's highly customised checkouts.

Merchandising, in ecommerce, is deciding what products a shopper sees and in what order — collection sort rules, search relevance, badging, and curated edits. It is the digital equivalent of a store layout. Good merchandising moves inventory that would otherwise sit, and it is one of the highest-leverage jobs a marketing team can do without a developer.

Metafields are custom fields that extend Shopify's built-in resources — products, variants, collections, customers, orders — with data the platform does not model natively. A typical use is a product's care instructions, size chart, or ingredient list. Metafields are typed, can be edited in the admin, and are readable from Liquid and the Storefront API.

Metaobjects are custom content types you define in Shopify — an author, a store location, a size guide — that exist independently of products and can be referenced from anywhere. Where a metafield adds a field to an existing resource, a metaobject creates a new resource entirely. Together they let Shopify act as a lightweight CMS without a separate system.

An OMS, or order management system, is the layer that decides how each order is routed, fulfilled, and tracked across warehouses, stores, and 3PLs. It is what makes ship-from-store, split shipments, and partial returns work as one coherent process. Merchants selling through several channels usually need one; a single-warehouse store typically does not.

Online Store 2.0 is the 2021 overhaul of Shopify's theme architecture. It introduced sections on every page (not just the homepage), JSON templates, app blocks that merchants can position without editing code, and a much richer metafields system. A theme built before OS 2.0 cannot use these features, which is a common reason to rebuild rather than patch.

Oxygen is Shopify's global hosting platform for Hydrogen storefronts. It runs your storefront code on a worker network close to shoppers, handles preview deployments per branch, and is included with a Shopify plan — so a headless build does not need separate hosting. It only runs Hydrogen; other frameworks host elsewhere.

A PIM, or product information management system, is the central store for product data — descriptions, specs, images, translations — that feeds every sales channel from one source. It earns its place when a catalogue is large, changes often, or has to be published in several languages and marketplaces at once. Below that, Shopify's metafields and metaobjects usually do the job.

Product schema is the Schema.org markup describing a product — its name, image, brand, price, currency, availability, and reviews. Implemented correctly, it lets Google show price and stock status directly in results, which raises click-through. The common failure is markup that disagrees with the visible page (a stale price, a fabricated rating), which risks a manual action rather than a rich result.

Redirect mapping is the URL-by-URL plan that sends every address on the old site to its equivalent on the new one, using 301 (permanent) redirects. It is the single most important SEO deliverable of a replatform: 301s pass ranking signals to the new URL, while an unmapped page becomes a 404 and loses them entirely. Shopify's fixed URL structure means most migrations need one.

Replatforming is moving a store from one ecommerce platform to another — Magento or WooCommerce to Shopify, most often. It is not a design project: the risk sits in data integrity, URL continuity, and integrations, and the failure mode is a launch that quietly loses a third of organic traffic. A safe replatform is planned around a redirect map and a staging store, not a launch date.

ROAS, or return on ad spend, is the revenue produced per dollar of advertising — $4 back on $1 spent is a ROAS of 4. It measures campaign efficiency, not profitability: a 4× ROAS on a product with a 20% margin still loses money. Blended ROAS, measured across all spend and all revenue, is harder to game than platform-reported figures.

robots.txt is a file at the root of a domain that tells crawlers which paths they may request. It controls crawling, not indexing — a URL blocked in robots.txt can still appear in search results if other pages link to it, and blocking it actually prevents Google from seeing the noindex tag that would remove it. To keep a page out of the index, allow the crawl and use noindex.

Sections and blocks are the units of a Shopify theme that merchants can rearrange in the theme editor without touching code. A section is a self-contained region of a page — a hero, a product grid — and blocks are the repeatable items inside it. Designing a theme as well-scoped sections is what makes a store editable by a marketing team instead of a developer.

A SERP, or search engine results page, is what a search engine returns for a query. Modern SERPs are far more than ten blue links: AI Overviews, shopping carousels, the local pack, People Also Ask, and video panels routinely push organic results below the fold. Reading the SERP for a query is how you tell what kind of page can realistically rank for it.

A Shopify app is an external service that extends a store through Shopify's APIs. Public apps are distributed through the Shopify App Store; custom apps are built for one merchant and installed directly. Apps are how you add functionality Shopify does not have natively — but each one adds JavaScript, cost, and a dependency, so an app audit is often the fastest performance win available.

Shopify Flow is Shopify's no-code automation tool, built around triggers, conditions, and actions. Typical workflows tag high-value customers, hold suspicious orders for review, re-order stock at a threshold, or push events into other apps. Flow removes a whole class of small custom-app work from a merchant's backlog.

Shopify Functions are small pieces of custom back-end logic that run inside Shopify's own infrastructure, at checkout speed. They let you customise discounts, payment and delivery method availability, cart validation, and bundling — the behaviour that used to require Shopify Scripts. Functions are written in Rust or JavaScript, compiled to WebAssembly, and deployed as part of an app.

Shopify Markets is Shopify's built-in toolset for selling internationally from a single store. It manages currencies, local pricing, duties and import taxes, domains or subfolders per market, and language translation — replacing the older pattern of running one store per country. Markets Pro adds a merchant of record service that absorbs compliance and fraud liability.

Shopify Plus is Shopify's enterprise plan, aimed at high-volume merchants. It adds checkout customisation through Shopify Functions and checkout UI extensions, higher API rate limits, up to nine expansion stores, wholesale channels, and the Launchpad and Flow automation tools. Pricing starts around USD 2,300/month and shifts to a revenue share above a threshold.

Shopify POS is Shopify's point-of-sale system for selling in person. It shares one product catalogue, inventory pool, and customer list with the online store, so stock and order history stay consistent across channels. It is the mechanism behind omnichannel features such as buy online, pick up in store.

A Shopify theme is the bundle of Liquid templates, sections, CSS, JavaScript, and settings that controls how a storefront looks and behaves. Themes are versioned separately from store data, so you can duplicate one, edit it safely, and publish when ready. Dawn is Shopify's free reference theme and the baseline most custom builds start from.

Site architecture is how a site's pages are organised and connected — the hierarchy of categories, collections, and products, and the links between them. A flat, logical architecture keeps important pages within a few clicks of the homepage and groups related content so search engines can infer topical authority. It is decided early and expensive to change later, which is why it belongs in the migration plan.

A SKU, or stock keeping unit, is the unique code identifying one sellable variant of a product — a specific size and colour, not the product as a whole. SKUs are the unit inventory is counted in, and how a store's catalogue maps to a warehouse, a 3PL, or an ERP. Clean SKU structure is the first prerequisite of any migration.

A staging store is a non-public Shopify store used to build and rehearse a migration before it goes live. It is where the data import is tested, the theme is built, integrations are wired, and the redirect map is validated — password-protected, so search engines never see it. Launching without one means testing in production.

The Storefront API is Shopify's public, customer-facing GraphQL API. It exposes products, collections, cart, and checkout to any frontend, and is safe to call from a browser because its access tokens are scoped to read-only storefront data. It is the interface every headless Shopify storefront is built on.

Structured data is machine-readable markup that tells search engines what a page means, not just what it says. On ecommerce sites it is written as JSON-LD following Schema.org vocabulary, and it is what produces rich results — star ratings, prices, and stock status in the SERP. It is also how AI search engines resolve entities, which makes it foundational to GEO.

Subscription commerce is selling on a recurring schedule rather than one order at a time — replenishment of consumables, curated boxes, or memberships. It converts a one-off purchase into predictable recurring revenue and raises LTV sharply, at the cost of managing dunning, churn, and subscriber-facing account tooling. On Shopify it is built on the Subscriptions APIs, usually through an app.

Upselling is prompting a shopper to buy a higher-value version of what they already intend to buy — a larger size, a premium tier, a longer warranty. It raises AOV without new traffic. Placement matters more than the offer: post-purchase upsells convert well precisely because they cannot jeopardise the original order.

A webhook is a message Shopify sends to your server the moment something happens — an order is paid, a product is updated, a customer is created — so external systems react immediately instead of polling for changes. Webhooks are delivered at least once and can arrive out of order, so a correct integration handles duplicates and verifies the HMAC signature on every request.

WooCommerce to Shopify migration is the move from a WordPress/WooCommerce store to Shopify. It is usually driven by performance, plugin conflicts, and the security burden of self-hosting. The specific risks are WordPress's permalink structure (which rarely maps cleanly to Shopify's fixed URL patterns) and blog content that must move without losing its rankings.

An XML sitemap is a machine-readable list of the URLs you want search engines to crawl, along with when each last changed. Shopify generates one automatically at /sitemap.xml and it cannot be edited directly. A sitemap helps discovery on large or poorly-linked sites; it does not force indexing, and listing a page there does not override a noindex tag.