GEO vs SEO vs AEO: What Actually Changed

Three letters keep getting rearranged, and underneath them sits one real question: what actually changed when engines started writing answers instead of listing links? This chapter separates the shift that matters from the naming debate that mostly does not.

The shift in one sentence

SEO competes for a position on a list. GEO competes for a place inside a written answer. Everything else follows from that.

The comparison

Do rankings still decide who gets mentioned?

Less than you would assume, and the founding experiment measured this directly. When the KDD 2024 researchers applied GEO methods to sources sitting at different search positions, the gains flowed downward: sources ranked fifth in the search results gained as much as 115.1% in answer visibility from added citations, while the visibility of the top-ranked source fell by 30.3% on average once others optimized. A generative answer is not a restatement of the rankings. It redistributes attention toward whichever source is most quotable for the specific question.

The mechanism explains why rankings still matter without settling anything. Engines find candidate sources largely through search, so ranking well still buys you candidacy: a seat at the audition. But the answer is then written from whatever retrieved material is clearest and most checkable, and a well-ranked page with nothing quotable on it loses that audition daily.

Two honest conclusions:

1. SEO still buys you the audition. Abandoning search visibility for “pure GEO” would cut you out of retrieval itself.
2. Ranking is not sufficient. The measured experiment shows answer visibility and search position are different contests with different winners, and the second contest is the one buyers now watch.

So where does AEO fit?

Nowhere different. AEO, Answer Engine Optimization, is the same discipline under another name, preferred by some vendors because “GEO” collides with geography in marketing vocabulary. LLMO and “AI SEO” are the same again. The tactics, the engines and the measurement problem are identical.

Our advice: pick one term for your team and stop relitigating it. We say GEO because the founding research paper does, and because it is the term buyers increasingly search and ask engines about. What deserves your attention is the column on the right of the table above, whatever you call it.

Does SEO still matter, then?

Yes, on two grounds. First, retrieval: most AI engines find candidate sources through search indexes, so being findable remains step zero. Second, the evidence above: well-ranking pages still feed the engine’s source pool.

What changes is what you do on top. SEO asks “do we rank for this keyword?” GEO asks “when a buyer asks this question, in any of its phrasings, how often do we appear in the answer, what does the engine say about us, and which sources made it say that?” Those are new questions, and they need new measurement, which is where this guide goes next.