Search is changing shape. For two decades, being found meant ranking in a list of links. Increasingly, it means being referenced in an answer — the summary at the top of Google, the response from ChatGPT, the recommendation Perplexity cites. Generative Engine Optimisation, or GEO, is the practice of preparing your brand for that shift.
Put simply, GEO is the work of improving how clearly search engines, AI assistants and answer engines understand, trust and reference your brand. It isn't a brand-new toolkit bolted onto SEO. It's the same foundations — technical clarity, useful content, genuine authority — organised around a new question: when an AI system generates an answer about your category, is your business one of the sources it draws on?
It helps to separate three terms that often get blurred. SEO improves how pages rank in traditional organic search. AEO — Answer Engine Optimisation — structures content so specific questions are answered clearly, the building blocks that feed snippets and AI responses. GEO is the broadest of the three: it's about brand-level visibility across AI-generated answers, built on entities, authority, citations and structured, retrievable content.
Why does AI search change visibility? Because the interface changes the behaviour. When someone reads a single synthesised answer instead of scanning ten links, the cost of not being mentioned rises. AI systems don't browse the way people do — they rely on signals: structured data that explains what a page means, consistent information that builds an accurate picture of your brand, and third-party references that establish trust.
So how do AI tools choose what to reference? No one outside the labs can describe the exact mechanics, and anyone claiming otherwise is overselling. But the observable pattern is consistent with good SEO hygiene taken further: clear entities, well-structured content, topical depth, accurate business information, and credible mentions across the wider web. Strengthen those, and you improve the likelihood of being discovered and referenced.
What can businesses do now? Start with the foundations that pay off either way — technical SEO, structured data, and genuinely useful content organised into topic clusters. Make sure your brand, people and services are described consistently everywhere. Build authority through earned coverage and strong reviews. None of this is wasted if AI search grows slowly; all of it compounds if it grows fast.
Measuring GEO is less about a single ranking and more about a blend of signals: visibility and mentions across search and AI tools, brand citations, referral traffic, impressions, and ultimately enquiries. The emphasis stays commercial — being referenced only matters if it leads somewhere.
The honest summary: GEO is an emerging discipline, not a guaranteed shortcut into AI answers. No agency can promise placement in ChatGPT or Google AI Overviews. What you can do is build the clarity, structure and authority that make your brand easier for these systems to understand and trust — and be early while most of your competitors are still waiting.