GEO vs SEO vs AEO: what's the difference, and which do you need?

Three acronyms now describe overlapping work, and the vocabulary has not settled. They are easier to keep apart once you ask what each one is competing for.

The short version

• SEO — search engine optimization. Competing for a position in a ranked list of links on Google or Bing.
• AEO — answer engine optimization. Shaping content so a system can lift it as the direct answer — featured snippets, voice assistants, AI answers.
• GEO — generative engine optimization. Getting your brand named and your site cited inside answers that AI engines write.

Side by side

What they share

All three reward the same foundations, which is why the labels blur:

• Pages that answer the question directly, early, in plain words.
• Crawlable, fast, well-structured sites. A page an engine cannot fetch cannot rank, be quoted, or be cited.
• Topical depth. Covering a subject properly beats a thin page per keyword, for search and for answers.
• Freshness on pages that matter. Updated pages earn more AI citations, and Google rewards maintained content too.

If you already do good SEO, you have a head start on the other two — but only a head start.

Where they differ

SEO: the page and its rank

SEO is still the largest discoverable channel for most businesses, and its mechanics are well understood: relevance to a keyword, links, and a site Google can crawl and trust. Its weakness in an AI world is that a rank says nothing about whether you are in the answer a customer reads. Roughly two thirds of pages in Google's top three never appear in AI answers to the same question.

AEO: the passage

AEO is a writing technique more than a channel. A question-shaped heading, a complete answer in the first sentence or two beneath it, and a self-contained passage that still makes sense when lifted out of the page. It helps you win featured snippets in Google and helps AI engines quote you, because both retrieve passages, not pages. See AEO for the acronym's other meanings.

GEO: the brand, across engines

GEO is the only one of the three that is mostly about other people's pages. AI engines name brands that appear consistently across what they read — "best X" lists, comparison articles, review sites, Reddit and YouTube — so a large part of GEO is getting onto the specific sources engines already cite for your questions. It also adds two things SEO never had to deal with:

• Mentions and citations diverge. Engines often use a page without naming its brand — a ghost citation — and name brands without citing their sites.
• Every engine is a separate channel. ChatGPT, Gemini and Claude agree on sources only about a tenth of the time, so visibility is measured per engine.

Which should you prioritize?

Work per question, not per acronym:

1. List the questions your customers ask — in Google and in AI assistants.
2. Check where you stand for each: your Google rank from Search Console, and whether AI answers name you. The free AI visibility checker gives a quick read across ChatGPT, Gemini and Claude.
3. Ranked in Google but missing from AI answers: this is a GEO gap. Get onto the third-party pages the engines cite, and make your own page lead with the answer.
4. Missing from both: start with a page that answers the question directly (AEO), then build the SEO and GEO around it.
5. Strong in both: keep the pages fresh and watch the trend weekly.

How to measure each

• SEO: rank, impressions and clicks per query in Google Search Console.
• AEO: whether your passage is the one shown — featured snippets in Search Console, and quoted passages in AI answers.
• GEO: mention rate and citation rate per engine, tracked on the same questions over time, plus your AI share of voice against competitors. The comparison of AI visibility tools covers how to track it.