60+ digital, marketing, and design terms , explained simply.
Every industry has its own jargon, and digital marketing has more than most. This glossary cuts through it with plain-English definitions for the terms you'll actually hear from agencies, developers, marketers, and platform documentation.
A
A/B Testing Conversion
A method of comparing two versions of a webpage, ad, or email to see which performs better. Visitors are split randomly between version A and version B, and results are measured to determine the winner.
Accessibility Design
The practice of designing websites and digital products so they can be used by everyone, including people with visual, motor, cognitive, or hearing impairments. Often abbreviated as a11y. Governed by the WCAG standard.
Algorithm SEO & Ads
A set of rules that platforms like Google or Meta use to decide what content to show, in what order, and to whom. Algorithms change regularly, which is why SEO and paid advertising require ongoing attention.
Alt Text SEO & Accessibility
Short, descriptive text added to images that tells screen readers and search engines what the image shows. Essential for both accessibility and image SEO.
Analytics Measurement
The collection and analysis of data about website or marketing performance. Most commonly refers to Google Analytics, the industry-standard free tool for tracking website traffic and behaviour.
Attribution Marketing
The process of identifying which marketing channels or touchpoints actually contributed to a sale or lead. Critical for understanding what's really driving results vs. what just gets credit.
B
Backlink SEO
A link from another website to yours. High-quality backlinks from reputable sites are one of the strongest signals Google uses to decide which pages deserve to rank.
Bounce Rate Analytics
The percentage of visitors who land on a page and leave without taking any further action. A high bounce rate may indicate slow loading, irrelevant content, or poor user experience.
Brand Voice Brand
The consistent personality and tone your brand uses across all communication, from website copy to social posts to customer emails. A strong brand voice makes you recognisable.
C
Call to Action (CTA) Conversion
An instruction designed to provoke an immediate response, such as a button that says "Book a Free Consultation" or "Download the Guide". Strong CTAs are specific and benefit-led.
Canonical Tag SEO
A piece of HTML code that tells search engines which version of a page is the "main" one, used to prevent duplicate-content issues across multiple URLs that show similar content.
Click-Through Rate (CTR) Ads & SEO
The percentage of people who see your ad or search listing and actually click it. A higher CTR usually means your title, description, and creative are working.
CMS (Content Management System) Web
Software that lets you build and manage a website without writing code from scratch. WordPress, Webflow, and Shopify are all examples of popular CMS platforms.
Conversion Rate Conversion
The percentage of visitors who take a desired action , buying a product, submitting a form, booking a call. The single most important metric for most websites.
Core Web Vitals SEO & Performance
A set of Google performance metrics (LCP, INP, CLS) that measure real-world user experience. Pages that fail Core Web Vitals tend to lose rankings and visitors.
CPA (Cost Per Acquisition) Ads
How much you spend to acquire one customer through advertising. CPA = total ad spend ÷ number of customers acquired. The most important paid advertising metric for most businesses.
CPC (Cost Per Click) Ads
The amount you pay each time someone clicks your ad. A useful efficiency metric, but a low CPC means little if the clicks don't convert into sales.
CRO (Conversion Rate Optimisation) Conversion
The practice of systematically improving a website to convert more of its existing visitors into customers, without increasing traffic.
D
Domain Authority SEO
A third-party score (developed by Moz) that estimates how authoritative a website appears to search engines. Higher scores correlate with better ranking potential, though Google itself doesn't use this exact metric.
E
E-E-A-T SEO
Google's framework for evaluating content quality: Experience, Expertise, Authoritativeness, and Trust. Content that demonstrates all four tends to rank consistently.
Engagement Rate Social
The percentage of viewers who interact (like, comment, share, save) with a piece of content. A stronger indicator of social media success than follower count.
F
Funnel Marketing
The structured path a potential customer takes from first hearing about you to becoming a paying customer. Stages usually include awareness, engagement, conversion, and retention.
G
GA4 (Google Analytics 4) Analytics
The current version of Google Analytics. Tracks how users interact with your website across devices and platforms, replacing the older Universal Analytics.
H
Heatmap UX
A visual representation of where users click, scroll, and move on a webpage. Tools like Hotjar and Microsoft Clarity generate heatmaps to reveal user behaviour patterns.
HTTPS Security & SEO
The secure version of HTTP, identified by the padlock icon in browsers. Essential for trust, security, and SEO , Google explicitly favours HTTPS websites.
I
Impressions Ads & SEO
The number of times your content, ad, or search listing was seen. Different from clicks , an impression doesn't require any interaction.
Internal Linking SEO
Linking from one page on your website to another. Strong internal linking helps both users and search engines understand your site structure and pass authority between pages.
K
Keyword SEO
The word or phrase someone types into a search engine. SEO is built around understanding which keywords your audience uses and creating content that answers them well.
KPI (Key Performance Indicator) Strategy
A measurable value that shows how effectively a business or campaign is achieving its goals. Conversion rate, CPA, and ROAS are all common digital marketing KPIs.
L
Landing Page Conversion
A standalone page designed for a single purpose , usually a paid ad campaign or specific marketing goal. Strong landing pages have one clear action and minimal distractions.
Lead Marketing
Someone who has shown interest in your business by sharing contact information , filling out a form, booking a call, or downloading a resource. Not yet a customer.
Lead Magnet Marketing
A free resource (guide, checklist, template) offered in exchange for an email address. Used to convert anonymous visitors into qualified leads you can follow up with.
LTV (Lifetime Value) Strategy
The total revenue a customer generates over their entire relationship with your business. LTV is what determines how much you can profitably spend to acquire customers.
M
Meta Description SEO
The short summary that appears under your page title in search results. While it doesn't directly affect rankings, a strong meta description can significantly improve click-through rates.
Mobile-First Design
A design and development approach that prioritises the mobile experience before scaling up to larger screens. Essential, since most web traffic is now mobile.
N
NAP (Name, Address, Phone) Local SEO
The core contact information for a local business. Consistency of NAP across the web (website, Google Business Profile, directories) is a key ranking factor for local search.
O
Off-Page SEO SEO
Everything that affects your rankings from outside your own website , primarily backlinks, brand mentions, and external authority signals.
On-Page SEO SEO
Everything you can optimise directly on your website pages: content, headings, internal links, metadata, page speed, and structured data.
Organic Traffic SEO
Visitors who arrive at your website from unpaid search engine results, as opposed to paid ads. Generally considered the highest-quality and most cost-effective traffic source.
P
Page Speed Performance
How fast a webpage loads. A slow site loses visitors and rankings , Google has explicitly named page speed as a ranking factor since 2018.
PPC (Pay Per Click) Ads
An advertising model where you pay only when someone clicks your ad. Google Ads is the largest PPC platform; Meta Ads operates similarly.
R
ROAS (Return on Ad Spend) Ads
Revenue generated divided by ad spend. A ROAS of 4 means £4 of revenue per £1 spent. The headline metric for measuring paid advertising performance.
Responsive Design Design
A design approach where a single website automatically adapts to look and work well on any screen size , phones, tablets, laptops, and large monitors.
Retargeting Ads
Showing ads specifically to people who have already visited your website or interacted with your content. Generally has higher conversion rates than reaching cold audiences.
S
Schema Markup SEO
Structured code added to a webpage that helps search engines understand its content. Can unlock rich results in search , star ratings, FAQs, prices, event details.
SEM (Search Engine Marketing) Marketing
An umbrella term for marketing on search engines, traditionally referring to paid search advertising (PPC). Sometimes used loosely to include SEO too.
SEO (Search Engine Optimisation) SEO
The practice of improving a website so it ranks higher in unpaid (organic) search engine results, primarily Google. Includes on-page, technical, and off-page work.
SERP (Search Engine Results Page) SEO
The page Google shows after someone searches. Contains organic results, paid ads, featured snippets, and various other features depending on the query.
Sitemap SEO
A file (usually XML) that lists all the important pages on your website, helping search engines find and index them efficiently. Usually located at /sitemap.xml.
Structured Data SEO
Code added to pages (usually via schema.org markup) that helps search engines understand the content's meaning, not just its words. Essential for rich search results.
T
Technical SEO SEO
The technical foundation that allows search engines to crawl, index, and rank your website: speed, mobile responsiveness, structured data, crawlability, and indexing.
Title Tag SEO
The HTML element that defines a webpage's title, shown in browser tabs and as the clickable headline in search results. One of the strongest on-page SEO signals.
U
UI (User Interface) Design
The visual design of a website or app , typography, colours, buttons, spacing, icons, and overall look and feel. UI is what users see and touch.
UTM Parameters Analytics
Tags added to URLs to track where traffic comes from. Standard format includes utm_source, utm_medium, and utm_campaign. Essential for accurate marketing attribution.
UX (User Experience) Design
The overall experience someone has using a website or app , how easy, intuitive, and satisfying it is. UX is broader than UI and covers everything from research to information architecture.
W
Wireframe Design
A low-fidelity, structural blueprint of a webpage , showing layout and content placement without styling or visual design. Used to agree on structure before designing visuals.
WordPress Web
The world's most widely used content management system, powering a significant share of all websites. Open-source, highly flexible, and supported by a massive ecosystem of themes and plugins.
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