SEO vs AEO vs GEO vs AIO: What's the Difference?

SEO, AEO, GEO and AIO are four overlapping approaches to getting found online. Here is what each means and how they fit together.

Updated: June 2026 Reading time: 5 minutes

The four acronyms, defined

SEO — Search Engine Optimization: rank links in search results.
AEO — Answer Engine Optimization: be the direct answer in snippets and voice.
GEO — Generative Engine Optimization: be cited inside AI-generated answers (ChatGPT, Perplexity, AI Overviews).
AIO — AI Optimization (or AI Overviews Optimization): an umbrella term for optimising for AI search; in practice it overlaps with AEO and GEO rather than being a separate discipline.

How SEO, AEO, GEO and AIO differ

The shift is from ranking a link (SEO) to being the answer (AEO) to being a cited source in a generated answer (GEO). AIO is the catch-all people use for "optimise for AI", which is really AEO + GEO together.

What they share

All four reward the same foundations: clear structure, trustworthy authorship, strong topical coverage and valid structured data. Improve those and you help every surface at once.

Which should you focus on?

Do SEO as your base, add AEO for answer surfaces and GEO for AI engines. Treat AIO as the umbrella, not a fifth checklist. Audit pages with the AEO Checker and GEO Checker.

Frequently asked questions

What is the difference between SEO, AEO, GEO and AIO?

SEO ranks links; AEO is the direct answer (snippets, voice); GEO is being cited in AI-generated answers; AIO is an umbrella term for optimising for AI search, overlapping AEO and GEO.

Is AIO a real discipline?

AIO (AI Optimization) is mostly used as an umbrella term. The concrete, distinct practices are AEO and GEO.

Do I need all of them?

Start with SEO, then add AEO and GEO. Their signals overlap, so one good page can perform across all surfaces.