Web Sites Industry Terminology

Accessibility (A11y)

Designing and building websites usable by people with disabilities, covering visual, auditory, motor, and cognitive needs; guided by standards like WCAG and practices like semantic HTML and ARIA.

Add aria-labels to form controls | Ensure keyboard-only navigation works on every page | Meet WCAG 2.2 AA for color contrast and focus states

Analytics (Web Analytics)

The collection, measurement, and reporting of website usage data to understand behavior and performance, often via tools like Google Analytics, Adobe Analytics, or self-hosted platforms.

Track sign-up events in GA4 | Build a funnel to measure checkout drop-off | Compare organic vs paid traffic in acquisition reports

API

An interface that allows software to communicate, enabling websites and apps to request or exchange data and functionality via protocols like REST or GraphQL.

Fetch product data from the CMS REST API | Secure endpoints with OAuth 2.0 | Throttle calls to respect API rate limits

Back-end

The server-side logic, databases, and infrastructure powering a website, handling data processing, business rules, and integrations.

Implement cart logic and inventory updates on the server | Expose a JSON endpoint for search | Connect the app to a PostgreSQL database

Backlink

An inbound hyperlink from another site to yours; a key off-page SEO signal affecting authority and rankings.

Earn backlinks from reputable publications | Audit toxic links and submit a disavow file | Track referring domains growth in SEO tools

CDN (Content Delivery Network)

A geographically distributed network of servers that caches and delivers content closer to users, improving performance, reliability, and scalability.

Serve images and video from edge locations | Use CDN caching headers to reduce origin load | Enable HTTP/2 and Brotli on the CDN

CMS (Content Management System)

Software used to create, manage, and publish website content, ranging from traditional (e.g., WordPress) to headless (content via API) architectures.

Publish blog posts in WordPress | Model content types in a headless CMS like Contentful | Schedule a landing page release

Conversion Rate (CVR)

The percentage of visitors who complete a desired action (e.g., purchase, signup); a core metric for growth and optimization.

Improve CVR by simplifying the checkout | A/B test CTA copy to lift sign-ups | Monitor CVR by channel in dashboards

DNS

The Domain Name System that translates human-readable domains into IP addresses and routes traffic via records like A, AAAA, CNAME, MX, and TXT.

Point the apex domain with an A record | Use a CNAME for www to the CDN | Lower TTL before a cutover to speed propagation

DOM

The Document Object Model, a browser representation of HTML used by scripts to read and manipulate a page’s structure and content.

Manipulate the DOM with document.querySelector | Listen for DOMContentLoaded before running scripts | Use virtual DOM diffing in React

E-commerce

Buying and selling goods or services online, including product catalogs, carts, payments, shipping, taxes, and order management.

Implement a cart and checkout flow | Integrate Stripe as the payment gateway | Track revenue and refunds in analytics

Engagement Rate

A measure of how actively users interact with a site (e.g., engaged sessions, pages per session, time on page), indicating content relevance and UX quality.

Use GA4 engaged sessions to replace bounce rate | Increase engagement with interactive demos | Monitor time on page for long-form content

First Contentful Paint (FCP)

A performance metric marking when the browser first renders any content (text, image, non-white canvas) to the screen.

Inline critical CSS to improve FCP | Defer non-critical JavaScript | Measure FCP with Lighthouse and Web Vitals

Front-end

The client-facing part of a website that users see and interact with, typically built with HTML, CSS, and JavaScript frameworks.

Build UI with HTML, CSS, and JavaScript | Implement a responsive grid using CSS | Optimize bundle size with code-splitting

GDPR

The EU’s General Data Protection Regulation governing personal data protection, consent, user rights, and processor responsibilities for EU residents.

Implement a consent banner for analytics cookies | Honor data deletion requests within 30 days | Sign DPAs with processors

Gzip Compression

An HTTP compression method that reduces payload size for faster delivery of text-based assets; often complemented or superseded by Brotli.

Enable Gzip (or Brotli) on the server/CDN | Compress text assets like HTML, CSS, JS | Verify content-encoding headers in responses

HTML

HyperText Markup Language, the standard for structuring web content with elements that convey document semantics and layout.

Use semantic tags like nav and main | Structure headings with an accessible H1–H6 hierarchy | Validate markup for errors

HTTPS

Secure HTTP over TLS that encrypts data in transit, authenticates the server, and prevents tampering or eavesdropping.

Install a TLS certificate via Let’s Encrypt | Redirect all HTTP traffic to HTTPS | Enable HSTS and TLS 1.2+

Indexing

The process by which search engines discover, parse, and store web pages so they can appear in search results.

Submit XML sitemaps in Search Console | Use noindex to prevent indexing of staging | Fix soft 404s to restore indexing

Information Architecture (IA)

The organization and labeling of content to support findability and usability, informing navigation, sitemaps, and content hierarchies.

Conduct card sorting to design navigation | Create a sitemap for a new section | Group content into clear categories

JavaScript

The programming language of the web used to create dynamic, interactive experiences in browsers and on servers via runtimes like Node.js.

Fetch data with the Fetch API | Build components with React or Vue | Optimize the main thread to reduce input delay

JSON-LD

A JSON format for linked data, commonly used to add structured data (Schema.org) to pages for eligibility in rich search results.

Add Product structured data via JSON-LD | Embed Organization schema in the head | Validate markup with Rich Results Test

Keyword Research

The process of discovering and prioritizing search queries to target with content, based on intent, volume, and competitiveness.

Map target keywords to landing pages | Use search intent to guide content | Evaluate difficulty and volume in tools

KPI

Key Performance Indicator; a measurable target aligned to business outcomes that gauges website or campaign success.

Set monthly KPIs for sign-ups and revenue | Track Core Web Vitals as performance KPIs | Review KPI progress in QBRs

Landing Page

A page designed for a specific campaign or audience with a focused message and call to action, optimized for conversions.

Spin up a PPC-specific landing page with a focused CTA | A/B test hero headlines | Remove nav to reduce distractions

Largest Contentful Paint (LCP)

A performance metric that reports when the largest visual element in the viewport is rendered; a core user-perceived loading metric.

Compress hero images to improve LCP | Serve images via a CDN with responsive sizes | Reduce server response time for HTML

Metadata (Meta Tags)

Information in the page head that describes content, indexation, and presentation (e.g., titles, meta descriptions, robots directives, social tags).

Write compelling title and meta description tags | Set meta robots noindex on gated pages | Configure Open Graph and Twitter cards

Mobile-First Design

An approach that designs for small screens first and progressively enhances layouts and interactions for larger viewports.

Start wireframes at small breakpoints | Use responsive images (srcset, sizes) | Test touch targets for accessibility

Noindex

A directive telling search engines not to index a page; implemented via meta robots or X-Robots-Tag HTTP headers.

Add meta robots noindex to staging | Send X-Robots-Tag headers for PDFs | Remove noindex to allow indexing after launch

Node.js

A JavaScript runtime built on V8 for executing JS on servers, enabling back-end services, SSR, and tooling.

Build an API with Express | Render pages server-side with Next.js | Run build scripts with npm

OAuth 2.0

An authorization framework for delegated access to resources via scoped tokens, enabling sign-ins and API access without sharing passwords.

Implement Authorization Code with PKCE for a SPA | Request only the minimal scopes needed | Refresh access tokens securely

Organic Traffic

Visits arriving via unpaid search engine results; influenced by SEO, content quality, and site authority.

Grow organic sessions with content and technical SEO | Monitor non-paid traffic by landing page | Attribute revenue to organic in reports

Pay-Per-Click (PPC)

A digital advertising model where advertisers pay for each click on their ads, commonly used in search and social platforms.

Launch a Google Ads search campaign | Optimize CPC and Quality Score | Track ROAS by ad group

Progressive Web App (PWA)

A web app that uses modern capabilities (service workers, manifest, HTTPS) to deliver app-like reliability, speed, and engagement.

Add a service worker for offline caching | Provide a web app manifest for installability | Use background sync for reliability

QA (Quality Assurance)

Processes and testing practices that ensure a website meets functional, performance, and usability requirements before and after release.

Run cross-browser tests before release | Automate regression tests in CI | Verify acceptance criteria against user stories

Redirects

Server responses that send users and bots to a new URL, preserving usability and (for 301) most SEO value when content moves.

Use 301 redirects for URL changes | Build a redirect map during a site migration | Normalize www and trailing slashes

Responsive Design

An approach that adapts layout, images, and interactions to different screen sizes and devices from a single codebase.

Implement CSS media queries and fluid grids | Use responsive images with srcset | Test layouts on common devices

Search Engine Optimization (SEO)

Practices that improve a website’s visibility in organic search through technical health, content relevance, and authority.

Fix crawl and indexation issues | Create content that targets search intent | Build internal links to key pages

Schema Markup

Structured data (often via JSON-LD) that annotates content for search engines, enabling enhanced listings like rich results.

Add Product, Review, and FAQ schema via JSON-LD | Validate with Schema.org and Search Console | Earn rich results like stars

Server-Side Rendering (SSR)

Generating HTML on the server at request time to improve perceived performance and SEO for dynamic pages.

Render HTML on the server for critical pages | Hydrate client-side components after SSR | Use SSR in Next.js for SEO-sensitive routes

Tag Manager

A system (e.g., Google Tag Manager) that manages and deploys marketing and analytics tags via a web interface and data layer.

Deploy pixels without code releases | Configure triggers based on dataLayer events | Control tag firing by consent state

Third-Party Cookies

Cookies set by domains other than the site being visited; used for cross-site tracking and increasingly restricted or deprecated by browsers.

Migrate to first-party cookies for analytics | Use server-side tagging as a mitigation | Update CMP messaging as browsers restrict 3P cookies

UTM Parameters

Query string tags added to URLs to attribute traffic and conversions to marketing campaigns in analytics platforms.

Append utm_source, utm_medium, utm_campaign to URLs | Standardize naming for accurate attribution | Audit UTMs to prevent double-counting

User Experience (UX)

The overall quality of a user’s interactions with a site, including usability, accessibility, performance, and satisfaction.

Conduct usability testing with target users | Map customer journeys and pain points | Prioritize fixes based on UX impact

Viewport

The visible area of a web page on a device; controlled by the meta viewport tag and used by responsive layouts.

Set meta viewport for responsive scaling | Use CSS units like vw and vh | Prevent layout shifts with proper viewport meta

WCAG

Web Content Accessibility Guidelines that define success criteria for making web content more accessible to people with disabilities.

Audit against WCAG 2.2 AA | Provide text alternatives for images | Ensure focus indicators are visible

XML Sitemap

An XML file that lists site URLs and metadata to help search engines discover and crawl content more efficiently.

Generate sitemap.xml and submit to Search Console | Split large sitemaps and use a sitemap index | Keep lastmod dates accurate

XSS (Cross-Site Scripting)

A security vulnerability where malicious scripts are injected into web pages, executed in users’ browsers, and used to steal data or hijack sessions.

Sanitize user input before rendering | Implement a strict Content Security Policy | Use templating that auto-escapes HTML

YMYL (Your Money or Your Life)

Google’s category for content that could impact users’ health, finances, or safety; held to higher quality and trust standards.

Add clear author credentials on medical content | Cite authoritative sources | Strengthen E-E-A-T signals for finance pages

Zero Downtime Deployment

Release strategies that update a site without service interruption by shifting traffic between versions or deploying gradually.

Use blue-green or canary releases | Run database migrations backward-compatible first | Health-check before shifting traffic