Summary: Answer engine optimisation (AEO) is the practice of structuring content so that it is selected as the direct answer to a question, whether that answer appears in a Google featured snippet, an AI Overview, a voice assistant’s reply or a chatbot such as ChatGPT. Where SEO aims for a ranking, AEO aims to be the answer itself. It overlaps heavily with generative engine optimisation (GEO); the difference is scope, not method.
A growing share of searches never reach a website. Our study of 1,000 UK keywords found AI Overviews on 42% of them, and our zero-click study found that 54.4% of UK searches end without a click to any site. When the answer is delivered on the results page, the business that supplied it wins the visibility and everyone else gets nothing. Answer engine optimisation is the work of being that supplier. This guide explains what AEO is, how it differs from SEO and GEO, where the answers come from, and the six things that decide whether your content is the one chosen.
Answer engine optimisation is the practice of writing and structuring content so that an “answer engine” can extract it and present it as the direct response to a question. An answer engine is any system that returns an answer rather than a list of links. The ones that matter for a UK business are:
What these have in common is that they choose one source, or a handful, and present it as the answer. AEO is about being chosen. In practice that means answering the question plainly, early and in a form the system can lift without needing the rest of the page.
AEO is not a replacement for SEO. Every answer engine draws its candidates from a search index, so a page that does not rank is not in the pool. What changes is the unit of competition and the definition of success.
| SEO | AEO | |
|---|---|---|
| Goal | A ranking position on the results page | Being selected as the answer |
| Unit | The page | The passage: a sentence or short paragraph |
| Format that wins | Comprehensive coverage of a topic | A direct answer in the first one or two sentences under a question-shaped heading |
| Where it shows | Organic listings | Featured snippets, PAA, AI Overviews, voice, chatbots |
| Measure | Rankings, impressions, clicks | Snippet and AI citation presence, share of answers, brand mentions |
| Click | The aim | Often does not happen; the visibility is the value |
The last row is the uncomfortable one. An answer engine may deliver your content without sending a visitor. The business still benefits, because it was named as the source, and because for most searches the person who reads the answer and then wants to buy searches again for the brand. But it means AEO cannot be measured on clicks alone, and it means the content you give away in the answer has to be the kind that makes people want the rest.
You will see answer engine optimisation and generative engine optimisation used interchangeably, and for most purposes that is fine. The distinction, where people draw one, is scope.
Put simply, AEO is one part of GEO: the part about the answer itself. If you want the full picture, our guide to what generative engine optimisation is covers the wider discipline; this article covers the answer.
Knowing how a system picks an answer tells you what to write. The process differs between platforms, but the shape is consistent.
Our research shows how far this has gone in the UK. Our SERP features study found that 98.7% of UK searches display at least one feature beyond the plain blue links, and our AI Overviews study found that 67% of AI Overviews appear on informational queries, with only 9% on commercial or transactional ones. The answer layer has largely taken over informational search; commercial search still sends clicks. That tells you where AEO pays: on the questions your customers ask before they are ready to buy.
Open every section with a one- or two-sentence answer to the question in its heading, then expand. This is the single biggest change for most sites, because most content does the opposite: it builds up to the answer. The Quick answer box at the top of this page is the same principle applied to the whole article.
Headings phrased as the questions people ask (“How long does SEO take?”, “What is an EICR?”) give the system an exact match between query and passage. Look at the People Also Ask box for your topic; it is a list of questions Google already wants answered.
A passage that depends on the paragraph before it cannot be lifted. Write each answer so it makes sense on its own: name the subject rather than saying “it”, include the key figure or definition in the sentence, and keep it under about 50 words before you move into detail.
Lists for steps and options, tables for comparisons, definitions set out as definitions. Answer engines lift these intact. Schema markup (FAQPage, HowTo, Article, Organisation) removes ambiguity about what the page is and who published it; our guide to schema and structured data covers how to add it. All of this is on-page SEO done carefully, which is why AEO starts with the fundamentals in our on-page SEO guide.
Generative systems prefer sources that show their working. A figure with a named source and a date is more likely to be cited than the same figure stated bare, and your own original data is the strongest source there is. It is why we publish our UK studies: they are the material AI systems cite, and the citation names us.
Answer engines favour recent sources because the answer is being written now. Show a visible last-updated date, refresh figures and rules when they change, and retire pages that are out of date rather than leaving them to be cited wrongly.
Clicks will not tell you. Track these instead, on a fixed set of the questions that matter to your business:
Our guides to appearing in AI results at the top of Google and getting your website cited by AI and LLMs cover the platform-specific checks.
No, but it is built on SEO. Ranking puts you in the pool of candidate sources; AEO is what gets you picked from it. A site with weak SEO cannot do AEO, and a site with strong SEO that buries its answers will watch competitors take the snippet.
It can reduce clicks on questions that are fully answered in the results, and those clicks were going somewhere anyway. What it earns is being named as the source, which is worth more than a click from someone who wanted a one-line answer. The commercial searches, where the click still happens, are where SEO proper carries the load.
FAQPage and HowTo for question-and-step content, Article with a named author for guides, and Organisation or LocalBusiness so the system knows who you are. Schema does not guarantee selection; it removes the reasons not to select you.
No. Content built for AEO (answer first, question headings, self-contained passages, structured, attributed, current) is the content GEO needs too. The GEO work that sits beyond it is about the brand and the site: mentions across the web, consistent business details, crawl access for AI bots. Our generative engine optimisation service covers both.
See also, our complete guide to SEO for UK businesses.
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