For years, "being discoverable online" mostly meant one thing: ranking well on a search engine results page. That's no longer the full picture. People now find businesses through traditional search, through answer engines that return a direct response, and increasingly through AI-powered search experiences that summarise and recommend rather than list links.
Each of these surfaces works differently, and a business that only optimises for one of them is leaving visibility on the table.
SEO: still the foundation
Search Engine Optimisation is about being found and ranked well on traditional search engines. It depends on technical health, relevant content, and the trust signals search engines use to judge quality. It remains the foundation everything else builds on — the other layers still rely on a site being properly structured and indexable.
AEO: optimising for the direct answer
Answer Engine Optimisation is about being the source an answer engine pulls from when someone asks a direct question, rather than one of several links a person has to click through. That usually means content structured clearly around the questions a business's customers actually ask, with answers that are easy to lift and attribute.
GEO: showing up in AI-generated answers
Generative Engine Optimisation extends that same idea to AI-powered search experiences, which synthesise information from multiple sources into a single response. Being cited or referenced inside that generated answer depends on content being clear, well-organised and genuinely useful — the kind of content a generative system can confidently draw from.
Why businesses need all three
A business's customers don't split neatly into "people who use traditional search" and "people who use AI search" — the same person moves between these surfaces depending on what they're trying to do. Treating SEO, AEO and GEO as one connected discoverability strategy, rather than three separate projects, is what keeps a business visible wherever that search actually happens.