Answer Engine Optimisation (AIO) is the practice of optimising a brand, its content, and its data so that AI answer engines — such as ChatGPT, Perplexity, Google AI Overviews, Gemini, and Copilot — cite it as the source in their generated answers. Where traditional SEO competes for ranked links, AIO competes to be the answer itself.
Why AIO matters now
Search is splitting in two. Alongside the familiar list of ranked links, a growing share of buyers now ask an AI engine and receive a single synthesised answer with a handful of citations. If your brand is not one of those citations, you are invisible at the exact moment a decision is being made — no matter how well you rank in classic search.
How AIO differs from SEO
SEO and AIO share foundations — clean, fast, crawlable, well-structured pages — but they optimise for different objectives.
- SEO optimises to rank a link in a list of results. AIO optimises to be the cited source inside a generated answer.
- SEO's unit of value is the click. AIO's unit of value is the mention and the trust a citation carries.
- SEO leans on keywords and backlinks. AIO leans on entity clarity, citable facts, structured data, and retrievability.
What it takes to be citable
Answer engines cite sources they can resolve, trust, and quote accurately. In practice that means establishing your brand as a clear entity, publishing content structured the way engines extract it, marking it up with schema.org, and making sure AI crawlers can actually reach and parse your pages.
AIO is not a single trick. It is a system of signals that, together, make an engine confident enough to put your name in its answer.