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

Your marketing agency says you need GEO. A consultant pitches AEO. Your web developer says it’s all just SEO. Everyone uses different letters for what sounds like the same thing, and you’re left wondering whether you need 3 strategies and 3 budgets.

You don’t. The terms describe overlapping goals in a search world where people increasingly get answers from AI assistants instead of a list of links. This guide clears up what each term means, how they differ, what the search engines say about them, and which tactics work across all 3.

The short definitions

SEO (search engine optimization) is the practice of helping your pages get discovered, crawled, indexed and ranked by search engines such as Google and Bing, so people click through from search results.

AEO (answer engine optimization) focuses on making your content the direct answer to a question, whether in an AI Overview, a chat assistant, a voice assistant or an answer box. Our guide to what is answer engine optimization covers it in depth.

GEO (generative engine optimization) focuses on getting your content used and cited inside responses written by generative AI systems, such as ChatGPT search, Perplexity, Copilot, Gemini or Google’s AI Mode.

In practice, AEO and GEO are used almost interchangeably. Some marketers use AEO for any “answer” format, including voice and featured answers, and GEO specifically for responses written by large language models.

Where the terms came from

SEO has been around since the early days of web search, when site owners first tried to understand how engines ranked pages.

AEO became popular as search engines and voice assistants started giving single direct answers instead of only lists of links. The goal was to become “the answer” rather than “a result.”

GEO was popularized by an academic paper, “GEO: Generative Engine Optimization,” first posted in November 2023 by researchers from Princeton University, IIT Delhi and independent researchers, and accepted to the KDD 2024 conference. The paper introduced a benchmark of 10,000 queries and tested ways to increase a source’s visibility in AI-generated answers. It reported that methods such as adding citations, quotations and statistics could boost visibility by up to about 40%, while keyword stuffing performed poorly.

AEO vs GEO vs SEO at a glance

Key takeaway: SEO, AEO and GEO aren’t 3 competing strategies. SEO is the foundation that gets your pages found. AEO and GEO are about how you write and structure content so AI systems choose it. Skip the foundation and the other 2 don’t work.

What Google and Microsoft say

The platforms themselves have weighed in, and their message is consistent.

Google. Google’s guide to optimizing for generative AI features defines AEO and GEO and says that, from the perspective of Google Search, both are part of SEO. It explains that AI Overviews and AI Mode are rooted in Google’s core ranking and quality systems. Google says there are no additional requirements or special optimizations to appear in those features beyond being indexed and eligible for a snippet. It also lists tactics to ignore for Google Search, such as splitting content into tiny chunks, creating llms.txt files and chasing inauthentic mentions. It warns that no third-party tool has access to its internal ranking or AI systems.

Microsoft. Bing’s webmaster guidance describes how Bing discovers, crawls and indexes content for both regular search and Copilot. It notes that good SEO doesn’t guarantee rankings and GEO doesn’t guarantee citations. Bing Webmaster Tools now includes an AI Performance report that shows how often your pages are cited in AI-generated answers and which grounding queries led there.

OpenAI. For ChatGPT search, OpenAI documents its OAI-SearchBot crawler separately from GPTBot, which relates to model training. Sites that block OAI-SearchBot won’t be shown in ChatGPT search answers. This is a technical SEO decision that directly affects GEO.

Tactics that work for all 3

Most of what helps one helps the others. Here’s a checklist that covers SEO, AEO and GEO together.

Technical foundations

• Make sure important pages are crawlable and indexed.
• Don’t accidentally block search crawlers in robots.txt, your CDN or firewall.
• Decide separately whether to allow AI search crawlers and AI training crawlers.
• Keep pages fast, mobile-friendly and free of intrusive interstitials.
• Keep important content in HTML text, not only in images or scripts.

Content and structure

• Put a direct 2-to-4-sentence answer near the top of each page.
• Use headings that match how people phrase questions.
• Use numbered steps, short paragraphs and comparison tables.
• Write from first-hand experience, with original examples, data or photos.
• Cite primary sources and name specific standards, laws and dates.

Trust and entity signals

• Show clear authorship and business information.
• Keep your Google Business Profile, Bing Places listing and product feeds accurate.
• Earn genuine reviews and mentions rather than buying them.
• Update outdated facts quickly.

For ecommerce, how AI shopping assistants pick products and our guide to ecommerce SEO for product and category pages show how this checklist applies to stores.

Where the differences actually matter

The overlap is large, but the emphasis shifts in a few areas.

Clicks vs citations. SEO success is often a click. In AEO and GEO, a user may get the answer without visiting your site. A citation still builds brand trust and can lead to later visits, so measure both direct traffic and brand searches.

Pages vs passages. Traditional SEO evaluates a page. AI systems often pull a specific passage that answers one part of a question. Clear sections that each answer a sub-question help, although Google says you don’t need to artificially chunk content.

Keywords vs intent. SEO research still starts with search terms. AI assistants handle long, conversational questions and understand synonyms, so AEO and GEO favor covering the real questions customers ask, in plain language.

Measurement maturity. SEO has decades of tools. AEO and GEO measurement is newer. Google includes AI Overviews and AI Mode traffic in Search Console’s Performance report, and Bing offers AI citation reporting. Third-party “AI visibility” tools can help with spot checks, but treat their numbers as estimates.

Accuracy risks. AI answers can misstate facts. If an assistant gets your business wrong, update your website and business listings first. Our guide to AI hallucinations explains why errors happen.

Do you need separate AEO or GEO services?

For most small and mid-sized businesses, no. A competent SEO program that emphasizes clear answers, original content, accurate business data and technical health covers most of what AEO and GEO require.

Be cautious of vendors who promise guaranteed placement in AI answers, sell bulk “mentions” or insist that special files and markup are the secret. Google specifically says many of these tactics don’t help in its search. Ask any vendor to explain how their work lines up with Google’s and Bing’s published guidance, and how they’ll measure results.

Where to start: a 5-step plan

1. Audit your technical SEO. Fix crawl, indexing and snippet issues first.
2. Pick your 10 most valuable questions. Use sales calls, support tickets and Search Console queries.
3. Rewrite those pages answer-first. Add direct answers, clear headings, tables and sources.
4. Update business and product data. Profiles, feeds, prices and hours.
5. Measure across channels. Track Search Console, Bing Webmaster Tools, AI referrals in analytics and monthly manual checks in the main assistants.

Conclusion

SEO, AEO and GEO describe one goal from 3 angles: helping people find trustworthy answers, wherever they search. SEO gets your pages found, AEO makes your content the clearest answer, and GEO makes it the source an AI system wants to cite. Build the foundation, write for real questions and keep your facts fresh, and you’ll cover all 3. For quick definitions of related terms, see our glossary.

Sources

• Google Search Central: Optimizing for generative AI features — AEO and GEO definitions and Google’s view that they are part of SEO
• Google Search Central: AI features and your website — eligibility for AI Overviews and AI Mode and Search Console reporting
• Aggarwal et al., GEO: Generative Engine Optimization (arXiv) — origin of the GEO term, KDD 2024, visibility findings
• OpenAI: Overview of OpenAI crawlers — OAI-SearchBot and ChatGPT search visibility
• Microsoft Advertising: The AI Performance dashboard in Bing Webmaster Tools — AI citation reporting