Almost every acronym the industry has coined for AI search — GEO, LLMO, AISO, GAIO, "AI SEO" — describes the same job: making your business easy for AI engines to understand, quote, and recommend. Strip away the branding and there are only two crafts underneath: being quotable enough for an engine to lift your answer, and being credible enough for an engine to cite your name. Here is the whole glossary, mapped once, so you never have to decode another LinkedIn thread.
Why are there so many names for one discipline?
Because naming a discipline is the cheapest way to look like you invented it. When AI answers started displacing result pages, every agency, tool vendor, and newsletter writer rushed to christen the new work — simultaneously, and without consulting one another. The result is a pile of acronyms that sound like rival fields but describe overlapping slices of the same practice. This happens every time search shifts. It has just never happened this fast, or produced this many logos.
The four terms worth knowing
SEO: search engine optimization
The original craft: earning rank in traditional results through crawlable pages, relevant content, and links. SEO is not dead, and AI engines lean on its plumbing more than the hype admits — a page that cannot be indexed cannot be retrieved, read, or quoted either. Every other acronym on this list runs through it.
AEO: answer engine optimization
AEO is the craft of being quotable: structuring content so an engine can lift a clean, direct answer from your page. It predates ChatGPT — featured snippets and voice assistants built the discipline — but AI answers raised the stakes considerably. The unit of AEO is the passage: one question, answered plainly in the first sentence or two, in words a machine can reuse without surgery.
GEO: generative engine optimization
GEO is the craft of being cited and recommended by generative engines — ChatGPT, Perplexity, Gemini, and their kin. Where AEO works at the level of the page, GEO works at the level of the entity: your name, your reputation, and your consistency across every source an engine might consult before deciding you are safe to mention. Reviews, directory listings, press, and third-party mentions all feed it.
AIO: AI Overviews optimization
AIO is the Google-specific slice: earning a place in the AI Overviews that now sit on top of many searches. It is not a separate craft so much as AEO and GEO applied to one very important surface — Google grounds those answers in indexed pages and known entities, so the same work feeds it. Think of AIO as a scoreboard more than a discipline of its own.
Which acronyms are just synonyms for GEO?
- LLMO (large language model optimization): GEO with the engine named differently. Same goal — get the models to know you and name you.
- AISO (AI search optimization): usually a straight synonym for GEO; occasionally stretched into an umbrella term for the whole field. Either way, nothing new inside.
- GAIO (generative AI optimization): GEO again, with a spare word. Popular in European marketing circles.
- AI SEO, LLM SEO, ChatGPT SEO: informal umbrella labels people reach for before they have committed to an acronym. Imprecise, but harmless.
A useful test: if someone sells you LLMO and GEO as separate line items, ask what differs in the deliverables. If the honest answer is "the invoice," you have learned something about the vendor too.
What are the two crafts underneath it all?
Being quotable is page-level work: answer-shaped writing, clean structure, schema markup, fast and crawlable pages. Being cited is entity-level work: consistent business details everywhere, reviews that corroborate what your site claims, and mentions on sources engines already trust. The two reinforce each other, and neither substitutes for the other. A quotable page from an unknown entity gets skipped; a known entity with unquotable pages gets summarized from someone else's description of it.
So what should you call it?
Whatever the person across the table calls it. Arguing acronyms is mostly a way to postpone doing the work, and the work is remarkably stable even while the labels mutate. At Speak Local we gave up on the alphabet soup and organized everything under four plain pillars — Local, SEO, AEO, GEO — because those are the things a business can actually act on and measure. Learn the two crafts, track whether engines quote and cite you, and every future acronym — there will be more — will translate itself on sight.
