GEO, SEO and AEO: what changes and what doesn't

There's a line you'll see all over Reddit and LinkedIn: "GEO is just SEO rebranded." It's partly true. The useful question isn't whether they're the same, but which parts of your SEO work already carry over and which parts are new.

Three acronyms

• SEO (Search Engine Optimization): ranking pages in search results to earn clicks.
• AEO (Answer Engine Optimization): optimizing so a system gives your answer directly. It grew out of Google's featured snippets and voice assistants, and today many people use it as a synonym for GEO.
• GEO (Generative Engine Optimization): getting the engines that write answers with AI to mention, cite and recommend your brand.

In practice, AEO and GEO overlap almost entirely. We use GEO in this course, but if a client says AEO or "AI SEO," they mean the same thing.

What doesn't change

Generative engines don't read the whole web every time you ask something. They search, and to search they use indexes. Google says it plainly in its documentation for AI Overviews and AI Mode: to show up as a supporting link, a page has to be indexed and eligible to appear with a snippet in regular Search, and there are no extra requirements or special optimizations. Copilot relies on Bing, and ChatGPT and Perplexity run their own crawlers, which you can allow or block in robots.txt.

So these still matter:

• Your site can be crawled and indexed.
• Important content lives in text, not just in images or behind JavaScript that never runs.
• You have genuinely useful pages on what your customers ask about.
• Other sites talk about you and link to you.

If your technical SEO is broken, fix that first. Everything else sits on top of it.

What does change

1. You work at the passage level. The engine doesn't show your page. It grabs a paragraph or two and blends them with others. A paragraph that answers well on its own beats a long page that takes forever to get to the point.

2. Questions get longer and more specific. Nobody types "invoicing software" into ChatGPT. They type "I'm a freelancer, I don't bill much and I want something cheap that handles e-invoicing, what do you recommend?" Behind the scenes, the engine turns that into several searches.

3. Brand matters more than links. An Ahrefs analysis of 75,000 brands found that brand mentions across the web were the factor most closely tied to appearing in AI Overviews, well ahead of backlinks. That's a correlation, not proof of cause, but it lines up with a 2025 University of Toronto study showing AI engines cite third-party media and sites far more than a brand's own website.

4. There are no stable rankings. A January 2026 experiment by SparkToro and Gumshoe ran the same prompts hundreds of times: the odds of getting the same list of brands twice were under 1 in 100. That's why GEO measures how often you appear, not what position you hold.

5. Success isn't always a click. When AI recommends your brand, that has value even if the user never clicks, because they search for you later or pick you. Measuring that takes new tools.

What to do with this

Don't spin up a GEO team separate from SEO. Treat GEO as another layer: the same technical and content foundation, plus three things classic SEO didn't prioritize as much:

1. Writing so that every passage can be quoted on its own.
2. Building your brand's reputation off your own site.
3. Measuring presence in AI answers, not just rankings and clicks.

And be wary of anyone selling GEO as something completely different that doesn't need SEO, or as plain old SEO that needs nothing new. Both positions are wrong.