AEO vs GEO vs SEO: What Is the Difference?

SEO wins a place in a list of links. AEO wins the direct answer to a question. GEO wins a citation inside an answer an AI writes from several sources. Three goals, one foundation: a page machines can fetch, read and understand.

That is the short version. The rest of this guide shows where they differ and where the work is the same.

The three terms in one table

	SEO	AEO	GEO
Stands for	Search Engine Optimization	Answer Engine Optimization	Generative Engine Optimization
Goal	Rank high in a list of links	Be the answer that is shown	Be a source the AI reads and cites
Where it shows	Google and Bing results	Featured snippets, AI Overviews, voice assistants	ChatGPT, Perplexity, Claude, Gemini, AI Mode
Unit that wins	A page	A passage	A source and a brand
Main levers	Links, keywords, technical health	Question headings, direct answers, structured data	Crawler access, content without JavaScript, facts, mentions on other sites
Failure looks like	Page three	Someone else's passage is quoted	You are not in the answer at all

SEO: the ranked list

Classic SEO optimizes for a position. A search engine returns ten links and the user picks one. Winning means being high on that list and earning the click.

Googlebot renders JavaScript, so a script-heavy site can still rank. That detail matters later, because AI crawlers behave differently.

AEO: the direct answer

Answer Engine Optimization started with featured snippets and voice search. The engine stops showing a list and shows one answer, lifted from one page. AEO is the craft of being that page.

The work is mostly about shape:

• One clear question per heading.
• The answer in the first two or three sentences under it.
• Facts stated plainly, with numbers and names, not buried in brand story.
• Structured data (schema.org) that labels what the page is about.

A note on FAQ schema: Google limited FAQ rich results to a small set of authoritative sites in 2023. The markup no longer earns most sites a visual snippet. It still gives machines a clean question and answer pair to read, which is why it remains useful for AEO and GEO.

GEO: the citation inside a written answer

Generative Engine Optimization targets engines that write a new answer from several sources. ChatGPT, Perplexity, Claude and Gemini fetch pages, pick the ones they can read and trust, and compose a reply. Sometimes they name and link the sources. Sometimes they only use them.

GEO asks a question that AEO skips: is your site in the source set at all? That depends on things classic SEO never tested:

• Crawler access. AI engines send their own bots, such as GPTBot, ClaudeBot and PerplexityBot. A robots.txt rule or a bot protection default can block them without anyone noticing.
• Content without JavaScript. AI crawlers read raw HTML. If your text only appears after scripts run, it does not exist for them. We cover this in Does ChatGPT read JavaScript?
• Entity facts. Who you are, what you sell, what it costs, stated in text and in structured data, so the engine does not have to guess.
• Mentions elsewhere. Engines lean on what other sites say about you, not only what you say about yourself.

For the full picture of GEO on its own, read What is GEO?

What happens when an engine knows nothing about you

We asked Google AI Mode about "Weonit", a name that belongs to no known AEO or GEO company. The first answer described its services anyway: AEO, GEO, technical AI readiness. Every claim came from general articles about the category. Only when asked for a website did it admit there was no such company.

That is the risk for a real brand with a thin footprint. When an engine has no clear facts about you, it does not stay silent. It fills the gap with what it knows about your category, or with a competitor. AEO cannot fix that, because there is no passage of yours to lift. Only GEO work fixes it: readable pages, stated facts and mentions on other sites.

Where the three overlap

Most of the work is shared. A page that is fast, crawlable, server-rendered and written as clear answers to real questions does well in all three. Google's own guidance for its AI features says the same SEO fundamentals apply.

The split looks like this:

Work	SEO	AEO	GEO
Content in raw HTML	Helps	Helps	Required
AI crawlers allowed in robots.txt	No effect	Partly	Required
Question headings and direct answers	Helps	Core	Core
Structured data	Helps	Core	Core
Backlinks	Core	Helps	Helps
Brand mentions on other sites	Helps	Little effect	Core

Which one to work on first

Do not pick one. Fix the shared foundation, in this order:

1. Check robots.txt for blocked AI crawlers. One line, immediate effect.
2. Make sure your most valuable pages deliver their text in the raw HTML.
3. Rewrite those pages so each key question gets a direct answer near the top.
4. Add schema.org markup for your organization and products.
5. Then work on the slow part: being described correctly on other sites.

You can run the first two checks in a terminal:

# Are AI crawlers allowed?
curl -s https://your-site.com/robots.txt | grep -iE "gptbot|claudebot|perplexitybot|google-extended"

# Does your text exist without JavaScript?
curl -s -A "GPTBot" https://your-site.com | grep -i "a phrase from your page"

For all seven manual checks, see the AI visibility audit guide. The scoring method behind our scan is public.

SEO, AEO and GEO all start with the same question: what can a machine read on your page? The free Siteiz scan answers it for one page in about a minute.