The terms that keep coming up in quotes and developer conversations, explained briefly, so the decision never turns on wording.
Checkout
The sequence of steps from the cart to a successful payment. The most critical part of a webshop: every unnecessary field and step causes measurable drop-off.
Variant
A version of the same product by size, colour or packaging, with its own stock and price. The variant structure determines how complex the catalogue is.
Attribute
A structured property of the product (material, weight, manufacturer, power rating). Filters, feeds and GPSR data fields are all built from these.
Core Web Vitals
Google's three user experience metrics: loading speed, interaction responsiveness and visual stability. They are measured on real user data.
SSR (server-side rendering)
The server sends finished HTML instead of the browser assembling it from JavaScript. This is what makes the content readable to search engines and AI answer engines.
Product feed
A structured product list (XML or CSV) for advertising and comparison platforms: Google Shopping, price comparison sites, the Meta catalogue.
GTIN / EAN
An international, barcode-based product identifier. Its absence is a typical reason for rejection on Google Shopping and on marketplaces.
Payment gateway
The provider that processes card payments (SimplePay, Barion, Stripe). The webshop only redirects and handles the callback; it never stores card data.
Webhook / callback
A notification from an external system to the webshop (for example about a successful payment). Handling duplicate or late callbacks is a classic source of bugs.
ERP
The enterprise system that manages stock, prices and orders. In an integration the main question is which system is the source of truth.
301 redirect
A permanent redirect from an old URL to a new one. In a migration this is what preserves search rankings and the strength of inbound links.
Structured data (schema)
Machine-readable markup about the product, price, stock and reviews. This is what enables rich results and citations in AI answers.
WCAG 2.1 AA
The middle level of the international accessibility standard. The practical benchmark of the EAA for e-commerce services.
Consent Mode v2
Google's consent handling framework. Without it, measuring ad conversions and building audiences is limited in the EU.
Server-side tracking
Measurement data goes to the analytics system from the server, not from the browser. It gives more accurate conversion data even with ad blockers and cookie restrictions.
Cart abandonment
When a visitor adds to the cart but does not complete the purchase. The most common causes: an unexpected shipping fee, forced registration, a slow or long checkout.
Multistore
Running several stores on a shared back end: separate domains, branding, languages or currencies, with a common catalogue and admin.
Staging environment
A test environment identical to production, where development and updates can be tried out risk-free before customers meet them.