Answer engine optimisation (AEO) is the discipline of structuring content so that AI systems, including Google AI Overviews, ChatGPT, and Perplexity, cite your page as the authoritative source rather than generating a generic paraphrase.
Traditional SEO was built around a simple assumption: rank the page, win the click. That model still holds for transactional queries, but it is eroding fast for informational ones. When a user asks Google "how does X work," they increasingly get a synthesised answer at the top of the page rather than ten blue links. ChatGPT, Perplexity, and Claude give answers with citations, not ranked lists. If your page is not structured to be cited by those systems, it may rank well and still receive zero visibility in AI-generated answers.
Answer engine optimisation is the response to that shift. Instead of optimising purely for a crawler and a ranking algorithm, AEO optimises for the way a language model reads, interprets, and decides to cite a piece of content. The criteria are meaningfully different.
SEO asks: will a search engine rank this page? AEO asks: will an AI system trust this page enough to quote it? The two questions overlap but they are not identical.
Search engines rely heavily on link authority, crawl frequency, and keyword density. AI citation systems care more about whether a page gives a clear, direct answer to a question; whether it cites its own sources or data; whether the structure makes the answer machine-readable; and whether the content reflects genuine expertise rather than assembled generalities. A page can have strong Domain Authority and still be invisible in AI Overviews because it buries its answer in three paragraphs of context-setting.
The most important structural difference: AI systems reward answer-first writing. If the direct answer to the user's question does not appear in the first 40 to 60 words of a section, many AI systems skip the page in favour of one that leads with the answer. That is a writing discipline, not a technical SEO tweak.
The highest-leverage moves for AEO are not complicated, but they require genuine editorial effort:
Lead with the answer. Every page and every major section should open with a direct, unambiguous answer to the question implied by the heading. Save the nuance for the paragraphs that follow.
Use first-hand data and specifics. AI systems, and Google's quality raters, give more weight to content that contains statistics, methodology, or observations that could only come from direct experience. A claim like "we found that 73% of pages cited in AI Overviews lead with a definition" is more citable than "most pages that rank well use clear structure."
Structure for machine readability. Clear headings, short paragraphs, and direct answers to likely follow-up questions all increase the probability that an AI system can extract a coherent citation from your page. FAQ-style sections, comparison tables, and step-numbered lists are all effective.
Build topical authority, not just keyword coverage. An AI system is more likely to cite a source it encounters repeatedly across a topic cluster. A tightly linked set of pages, each one genuinely useful, signals authority in a way that a single isolated article cannot.
Earn trust signals. Schema markup (especially FAQ, HowTo, and Article types), cited sources within the body of the text, and bylines with demonstrable credentials all increase citation likelihood.
AEO is not a magic formula for appearing in every AI answer. It is not a replacement for building genuinely useful content. And it is not a loophole: AI systems are increasingly good at distinguishing between content that is structured to help readers and content that is structured to game a system. The latter tends to get filtered out as quality signals improve.
It is also not the same as generative engine optimisation (GEO), a related but distinct concept. GEO focuses specifically on optimising for how generative AI models retrieve and synthesise content. AEO is the broader discipline that includes GEO but also covers Google's AI Overviews and other AI-assisted search formats. See our AEO vs GEO breakdown for the full disambiguation.
Google's AI Overviews now appear on a significant share of informational queries in markets where the feature is live. Perplexity passed 100 million monthly active users in 2024. ChatGPT's browse-with-Bing feature makes web citations a standard part of its answers. The share of queries that produce an AI-generated answer, rather than a ranked list, is growing quarter on quarter.
For publishers and brands that depend on organic search traffic, this is not a future problem. Pages that are not structured for AEO are already losing impressions to AI answers. The good news is that the pages most likely to be cited are also, almost universally, the pages most useful to human readers: specific, honest, well-structured, and grounded in real expertise. AEO and editorial quality are the same thing.
Related: AEO vs SEO: a side-by-side comparison · How to rank in Google AI Overviews · What is a content moat?
Quarrybank finds the gaps worth owning, drafts answer-first pages past a quality gate, and banks the research so your AEO advantage compounds.
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