In one sentence: SEO gets you into the ranked list of links. AEO gets you into the direct answer box. GEO gets you into the AI-generated response that increasingly replaces both.
Why this question matters now
Three years ago, “search optimisation” meant one thing: Google rankings. Today, it means at least three distinct things — and confusing them costs budget, time, and competitive ground.
SEO (Search Engine Optimisation) is the 25-year-old discipline of making your website rank in Google's blue-link results. AEO (Answer Engine Optimisation) emerged with voice search and featured snippets — the practice of structuring content so search engines can extract it as a direct answer. GEO (Generative Engine Optimisation) is the newest discipline: making your brand visible inside fully AI-generated responses from systems like ChatGPT, Perplexity, and Google AI Mode.
Understanding how these three overlap, differ, and interact is now a prerequisite for any marketing investment decision in search.
The three disciplines defined
SEO — Search Engine Optimisation
What it targets: Ranked positions in Google and Bing search results pages (SERPs) — the traditional list of ten blue links.
How it works: A combination of technical website health (crawlability, page speed, schema), on-page content relevance (keyword targeting, topical depth, internal linking), and off-page authority (backlinks, brand mentions, domain authority).
What success looks like: Page 1 rankings for target keywords, organic traffic growth, click-through-rate improvements.
The limitation in 2026: Zero-click searches reached 69% of all Google queries in 2025, up from 56% the year before. Even when your page ranks first, a growing proportion of users get their answer from an AI Overview or featured snippet and never click. SEO remains essential — but it is no longer sufficient on its own.
AEO — Answer Engine Optimisation
What it targets: Direct-answer extraction — appearing as the featured snippet, inside Google AI Overviews, and as the answer read aloud by voice assistants.
How it works: AEO requires content structured for extraction rather than reading. This means: starting sections with a direct 40–60 word answer to an implied question, using FAQ schema, implementing HowTo markup where relevant, writing in plain language, and organising content so that a specific sentence or paragraph can stand alone as a complete answer.
What success looks like: Featured snippet appearances, inclusion in AI Overview answer blocks, Google “People Also Ask” coverage, voice search answers.
The distinction from GEO: AEO is primarily optimising for Google's own direct-answer systems — AI Overviews, featured snippets, Knowledge Panels. GEO extends this into the broader ecosystem of independent AI platforms (ChatGPT, Perplexity, Claude) that operate outside Google's direct control.
GEO — Generative Engine Optimisation
What it targets: Citation within AI-generated responses across ChatGPT, Perplexity, Google AI Mode, Microsoft Copilot, Claude, and Gemini.
How it works: GEO requires a combination of AEO-style content structuring plus entity optimisation (ensuring AI systems have clear, consistent knowledge about your brand), authority signal building (third-party mentions, citations, digital PR), platform-aware content strategy, and verifiable, source-backed claims that AI systems can trust.
What success looks like: Your brand appearing by name in AI-generated answers to relevant queries, AI-referred traffic to your website, consistent citation across multiple AI platforms.
The key difference from AEO: AEO is primarily a content and technical discipline. GEO adds entity management, brand authority strategy, and an understanding of how different LLMs retrieve and represent information — making it a broader and more complex programme.
Side-by-side comparison
| SEO | AEO | GEO | |
|---|---|---|---|
| Primary target | Google/Bing ranked links | Featured snippets, AI Overviews, voice | ChatGPT, Perplexity, Claude, Gemini |
| Content style | Keyword-optimised, long-form | Direct-answer structured | Extraction-ready, entity-rich, verifiable |
| Technical focus | Crawl, Core Web Vitals, indexation | FAQ schema, HowTo schema, structured data | Organisation schema, entity markup, LLM crawl access |
| Authority building | Backlinks, Domain Authority | E-E-A-T signals, author credibility | Entity mentions, third-party citations, knowledge graph |
| Speed to results | 3–12 months | 4–12 weeks (schema/snippets) | 4–8 weeks (technical); 3–6 months (authority) |
| Primary metric | Rankings, organic traffic | Featured snippet share, AI Overview inclusion | AI citation rate, AI-referred traffic |
| Zero-click benefit | None (traffic loss) | Partial (brand seen but no click) | High (brand cited directly in answer) |
| Investment priority | Foundation — always required | Layer 2 — implement alongside GEO | Layer 2 — implement alongside AEO |
How the three disciplines interact
The most important thing to understand about GEO, AEO, and SEO is that they are not competing alternatives. They are layers of the same programme.
SEO creates the foundation. AI systems — every single one of them — predominantly cite pages that are already well-indexed and authoritative in Google's eyes. A page that does not rank will not be cited. Technical SEO, domain authority, and topical relevance are the prerequisites for everything that follows.
AEO makes your content extraction-ready. The direct-answer blocks, FAQ schema, and structured content that AEO requires are exactly the content formats that AI systems extract from pages they trust. Implementing AEO tactics makes your content more visible to Google's AI Overviews and more extractable by ChatGPT, Perplexity, and the rest. AEO and GEO share most of their content and technical tactics.
GEO extends authority into the AI ecosystem. Where AEO focuses on content structure, GEO extends further: ensuring your brand entity is clearly defined across the web, building third-party citation signals, monitoring AI citation patterns, and adapting to the retrieval behaviours of different LLM platforms. GEO is what turns a content-optimised page into a consistently cited authority.
The correct sequence for most UK B2B businesses is:
Fix SEO foundations (technical health, indexation, authority baseline)
Implement AEO and GEO content tactics simultaneously (they share 70% of their implementation)
Build entity and authority signals over time (the compound value driver)
Which does your business need most right now?
You need SEO if:
Your website has technical issues (slow load times, crawl errors, poor indexation)
You are not ranking for any of your target keywords
Your domain authority is low or your backlink profile is thin
You have not yet built out topical content clusters
You need AEO if:
You rank well but are losing traffic to featured snippets and AI Overviews
Your competitors are appearing in answer boxes and you are not
You have a high volume of informational and question-based queries in your sector
You are investing in content but not seeing structured-data benefits
You need GEO if:
Your buyers are conducting early-stage research in ChatGPT, Perplexity, or Google AI Mode
You are in a sector (financial services, legal, healthcare, construction) where AI citation carries authority and trust
Competitors are beginning to appear in AI-generated recommendations and you are not
You want to capture AI-referred traffic, which converts at 2.4× the rate of traditional organic search
The honest answer for most UK B2B businesses in 2026: You need all three, implemented in the right order. The most common failure mode is investing heavily in AEO or GEO on a weak SEO foundation — generating no results and concluding that AI optimisation “does not work.”
The B2B regulated sector case
For UK financial services firms, law firms, healthcare companies, and construction businesses, the GEO opportunity is disproportionately large for three reasons.
First, buyer behaviour has shifted early in regulated sectors. Research from Forrester (2025) found that 89% of B2B buyers now use AI to research vendors before speaking to sales. In sectors where purchase decisions are high-value and high-stakes — selecting a financial adviser, instructing a law firm, choosing a healthcare technology provider — buyers are using AI systems to generate shortlists, check credentials, and validate expertise. If your brand is not in those AI-generated shortlists, you are not being considered.
Second, competition for AI citations in regulated sectors is low. Most financial services, legal, and healthcare firms are not yet investing in GEO. The agencies that serve them are still primarily focused on traditional SEO. This creates an early-mover window that is narrowing as awareness grows.
Third, regulated sector content is uniquely well-suited to GEO. AI systems have a strong preference for verifiable, expert, well-sourced content in sensitive topic areas (finance, health, law fall under what Google calls “Your Money or Your Life” categories). A firm that consistently publishes well-attributed, factually rigorous content on regulatory topics — FCA changes, SRA updates, NHS procurement trends — is building exactly the kind of authority profile that AI systems prefer to cite.
How MarGen delivers all three
MarGen's programmes for UK regulated B2B businesses integrate SEO health, AEO content structuring, and GEO entity and authority strategy into a single coherent programme. We do not treat these as separate services because they are not — the content, technical, and authority work compounds across all three disciplines simultaneously.
Our starting point is always a GEO visibility audit: a diagnostic of where your brand currently appears (or does not appear) in AI-generated responses to the queries your buyers are asking. From that audit, we build a prioritised programme of content, technical, and entity work that moves you from absent to cited across the AI ecosystem.
Key statistics at a glance
69% of Google searches ended without a click in 2025, up from 56% in 2024
Cited brands in Google AI Overviews earn 35% more organic clicks and 91% more paid clicks
AI-referred traffic converts at 2.4× the rate of traditional organic search
Google AI Overviews appear in ~25% of all Google searches as of Q1 2026
89% of B2B buyers use AI to research vendors before speaking to sales (Forrester, 2025)
47% of B2B buyers now begin vendor research in ChatGPT or Claude rather than Google
Frequently asked questions
What is the difference between GEO, AEO, and SEO?
SEO targets ranked links in Google results. AEO targets direct-answer extraction — featured snippets, AI Overviews, voice answers. GEO targets citation inside fully AI-generated responses from ChatGPT, Perplexity, Claude, and Gemini. All three share technical and content foundations but require distinct strategies.
Should a UK B2B business invest in GEO, AEO, or SEO first?
SEO foundations must come first — AI systems predominantly cite well-indexed, authoritative pages. Once solid SEO infrastructure is in place, GEO and AEO should be built simultaneously. For regulated B2B businesses, GEO and AEO deliver high ROI because competitors are typically under-invested in both.
Is AEO the same as GEO?
AEO and GEO overlap significantly but are not identical. AEO focuses on structured content for direct-answer extraction within Google's systems. GEO is broader — covering the full generative AI ecosystem and including entity optimisation, brand mention strategy, and multi-platform AI retrieval architecture.
Can you do GEO without SEO?
No. GEO without SEO foundations is ineffective. Generative AI systems retrieve and cite pages that are already well-indexed and authoritative. Technical SEO is the infrastructure GEO builds on top of.
Which platforms does each discipline target?
SEO primarily targets Google and Bing. AEO targets Google AI Overviews, featured snippets, and voice assistants. GEO targets ChatGPT, Perplexity, Google AI Mode, Microsoft Copilot, Claude, and Gemini. A complete programme covers all three disciplines across all platforms.
Want to know where your brand sits across all three disciplines? Request a free GEO, AEO, and SEO visibility assessment from MarGen →
MarGen is a London-based B2B GEO agency for regulated industries. We help UK financial services firms, law firms, healthcare companies, and construction businesses become the sources AI systems cite. See our approach →