AEO vs SEO: what is the difference?

Two disciplines, two targets

SEO (search engine optimisation) has been the dominant content discipline for two decades. It asks: how do I get this page to appear near the top of Google's ranked results for a given query? The mechanisms include link authority, technical crawlability, keyword placement, page speed, and structured data. A well-executed SEO strategy wins clicks from people who scroll past the paid ads to the organic results.

AEO (answer engine optimisation) asks a different question: how do I get an AI system to cite this page when it generates an answer? Google AI Overviews, ChatGPT, Perplexity, and Claude all produce synthesised responses with citations. If your content is not structured to be cited, you may rank well in traditional search and still be invisible in the AI layer that appears above the results.

Side-by-side: what each optimises for

Goal. SEO: a top-ten ranked position. AEO: a citation or direct quote in an AI-generated answer.

Primary signal. SEO: domain authority, backlinks, keyword relevance, technical health. AEO: answer clarity, first-hand specifics, machine-readable structure, topical depth.

Content format. SEO: comprehensive, keyword-dense, internally linked pages. AEO: answer-first writing with clear headings, direct statements, and cited data.

Success metric. SEO: organic click-through rate and ranked position. AEO: appearance in AI Overviews, ChatGPT citations, Perplexity source panels.

Who the audience is. SEO: a ranking algorithm. AEO: a language model that is deciding which source to trust.

Where they overlap

The two disciplines are not opposites. Pages that earn backlinks tend to be the same pages that are specific, well-structured, and genuinely useful, which are also the qualities that make content citable by AI. Google has said that its AI Overviews draw on the same quality signals it uses for traditional search. A page that is good for SEO is usually a reasonable starting point for AEO.

The overlap is strongest on trust signals. E-E-A-T (experience, expertise, authoritativeness, trustworthiness), Google's quality framework for human raters, maps almost directly onto what makes AI systems more likely to cite a source. Both reward content written by someone who has actually done the thing, with data to prove it.

Where they diverge, and why it matters

The sharpest divergence is in answer positioning. A traditional SEO page might spend two paragraphs of context before stating its main claim, because that context signals depth to a ranking algorithm. An AI system, reading the same page, may extract only the first coherent answer it finds. If that answer is buried, the AI cites a competitor whose answer appears in the opening sentence.

A second divergence is in query format. SEO has always targeted keyword phrases. AEO increasingly targets natural-language questions, because that is how people talk to AI systems. "Best content strategy tools" is an SEO query. "What is the best approach to content strategy for a B2B SaaS company?" is an AEO query. The page that answers the second version well is usually more useful and more likely to be cited.

When each matters most

SEO remains the dominant discipline for transactional and navigational queries: someone searching for a brand name, a product category, or a local service is still likely to click a ranked result rather than read an AI answer. AEO matters most for informational and comparison queries, exactly the kind of questions where AI systems now generate answers before the ranked list appears.

For publishers, brands, and content teams, the practical conclusion is that AEO does not replace SEO. It sits on top of it. A page that cannot be crawled and ranked is unlikely to be cited by AI either. But a page that ranks well and is not structured for AEO is increasingly likely to win the position and lose the impression to an AI answer above it.

For a full treatment of the AEO discipline, see what is answer engine optimisation. For the distinction between AEO and its close cousin, see AEO vs GEO.