Three acronyms. Three different jobs.
Most agencies pitch GEO when they mean AEO. Most pitch AEO when they mean SEO with a chatbot bolted on. The conflation is not academic — it is a sourcing-and-procurement mistake that costs CMOs millions in misallocated budget every quarter.
Here is the working definition, the discipline behind each, and the test you can apply when an agency walks into the room.
SEO — Search Engine Optimization
SEO optimizes for ranked retrieval against a keyword. The output surface is ten blue links — or, increasingly, a constrained subset of those links plus a featured snippet. The discipline has thirty years of methodology. Domain authority, link graph, on-page signals, page experience, schema, content depth, E-E-A-T.
The buyer journey assumed by SEO is a click. The user types a query. The search engine returns ten options. The user evaluates the options, clicks one, and lands on a property where the brand has a conversion mechanism.
SEO is not dead. But the surface SEO optimizes for is shrinking. Google's AI Overviews, featured snippets, and zero-click results are consuming more of the query volume that used to flow through to websites.
AEO — Answer Engine Optimization
AEO optimizes for inclusion in a synthesized answer. The output surface is not a list of links — it is a generated paragraph, summary, or conversational response that may or may not cite a source.
The discipline is newer, but it borrows heavily from SEO: structured data, entity salience, topical authority, and content that directly answers questions in natural language. The difference is that AEO assumes the user will not click. The answer is the destination.
AEO is what most brands need when they say they want to "show up in ChatGPT." It is optimization for LLM retrieval-augmented generation (RAG), for Google's AI Overviews, for Bing Chat, for any interface where the model synthesizes an answer instead of returning a list.
The test: if the agency talks about "optimizing for AI" but the deliverable is a keyword map and meta descriptions, that is not AEO. That is SEO with a rebrand.
GEO — Generative Engine Optimization
GEO optimizes for citation and attribution inside a generative engine. The output surface is a conversational interface — ChatGPT, Claude, Perplexity, Gemini — where the model generates an answer and may cite one or more sources inline or in a footnote.
GEO assumes the user is not searching. They are asking. The query is longer, more conversational, more contextual. The model is not ranking ten pages. It is synthesizing one answer from dozens or hundreds of sources, and it is choosing which sources to cite based on factors we are only beginning to understand.
The discipline is still being invented. Early signals: brand mentions in training data, structured knowledge graphs, high-authority backlinks, recency, and — critically — whether your content is accessible to the model's retrieval layer. If your site blocks crawlers, if your content is paywalled, if your knowledge is locked in PDFs or behind login walls, you do not exist in GEO.
The test: if the agency cannot show you a citation benchmark — how often your brand is cited in ChatGPT versus competitors, across a sample of queries — they are not doing GEO. They are guessing.
Why This Matters
Because the three disciplines require different teams, different tools, and different success metrics.
SEO is measured in rankings, traffic, and conversions. AEO is measured in answer inclusion and zero-click visibility. GEO is measured in citation share and conversational presence.
If you hire an SEO agency to do GEO, you will get a keyword strategy and a blog calendar. If you hire a GEO agency to do SEO, you will get citation tracking but no traffic. If you hire an AEO agency to do either, you will get schema markup and a prayer.
The disciplines are converging, but they are not the same. And the agencies that conflate them are either confused or dishonest.
Ask for the benchmark. Ask for the methodology. Ask what surface they are optimizing for, and what they are measuring.
Then decide which acronym you actually need.
