SEO vs AEO vs GEO: What’s the Difference?
A plain-English guide to the three ways people — and machines — find you online, and why 2026 changed the game.
For twenty years, “getting found online” meant one thing: rank on Google. In 2026 it means three. The same person looking for what you sell might type a phrase into Google, read the answer box without clicking anything, or simply ask ChatGPT and take its word for it. Those are three different systems — and being found now means showing up in all three. Here’s what SEO, AEO, and GEO actually mean, in plain English, and why you can no longer afford to think about only the first.
SEO — Search Engine Optimization
The classic. SEO is the practice of getting your pages to rank high in a search engine’s list of blue links. You do it by matching what people actually search for, earning links and trust from other sites, and making your pages easy for Google to read. The goal is a click: someone searches, sees your result, and comes to your site. SEO has been the backbone of online visibility for two decades, and it still matters — but it’s no longer the whole story, because people don’t always click anymore.
AEO — Answer Engine Optimization
Somewhere along the way, Google stopped just listing links and started answering. The box at the very top of the results — the featured snippet, the “People Also Ask” drop-downs — often answers the question outright, and the searcher never scrolls. AEO is the practice of being that answer. Instead of aiming for a ranked link, you aim to be the concise, quotable response the engine lifts to the top. It rewards clear, direct writing: a real question, with a real answer right underneath it.
GEO — Generative Engine Optimization
This is the new one, and it’s the biggest shift. “Generative engines” are the AI assistants — ChatGPT, Gemini, Claude, and Google’s own AI Overviews — that don’t hand you links at all. They read the web, synthesize an answer in their own words, and name a handful of sources. GEO is the practice of being one of the sources they name. When someone asks an AI “what tool checks alcohol labels before you file them?” the win is the AI answering “COLAClear” — by name, described correctly. That’s not a click; it’s a recommendation, delivered by a machine the person already trusts.
The three, side by side
| What it optimizes for | What winning looks like | |
|---|---|---|
| SEO | A ranked link on the results page | You’re result #1, and they click through |
| AEO | The answer box at the top | Your text is the answer they read |
| GEO | A mention inside an AI’s answer | The AI names you as the source |
Why this matters now
But here’s the trap: you can rank #1 on Google and still be invisible where it counts. If a buyer asks an AI instead of searching — and more of them do every month — your beautiful #1 ranking never enters the conversation. The AI names whoever it names, and if that’s not you, you don’t exist in that moment. GEO is how you make sure it’s you.
You don’t pick one — they stack
The good news: you don’t have to choose. SEO, AEO, and GEO aren’t competitors — they’re layers built on the same foundation. Useful content aimed at real questions, a site machines can read, one consistent identity, and earned authority feed all three at once. Do the underlying work well and you show up as a ranked link, and as the answer box, and as the AI’s named source. Neglect it and you slowly vanish from all three.
Where to start
You build all three the same way — through a handful of concrete mechanics: chase the specific phrases buyers actually type, keep one consistent name everywhere, add the behind-the-scenes signals that let machines read and quote you, and publish genuinely useful material on a cadence. Each step, with a real example behind it, is laid out in the Playbook.
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Sources & further reading
- Google Search Central — AI features and your website — Google's own guidance on how AI Overviews use your content
- schema.org — the shared vocabulary behind the structured data that tells machines what your page is
- Google Search Central — Intro to structured data — how structured data works and why Google reads it
- llmstxt.org — the /llms.txt proposal — the emerging convention for briefing AI systems about your site
- LLMPulse — A Guide to Generative Engine Optimization (GEO) — a deeper walkthrough of GEO tactics