AEO vs GEO vs SEO: Understanding the Differences and Their Relationship
A clear comparison of AEO, GEO and SEO: goals, outputs, what each optimizes, how they overlap, how to prioritize them and what an AEO/GEO expert actually does.
Contents
AEO, GEO, SEO, and occasionally LLMO, AIO and SAIO: the acronyms multiply faster than the practices change. This article defines the three that matter, shows exactly how they differ and explains how they fit together. If you want the full introduction to each, read what is AEO? and what is GEO?.
One-sentence definitions
- SEO (search engine optimization): improving how pages are found, understood and ranked in search results.
- AEO (answer engine optimization): making content clear and trustworthy enough to be selected as the direct answer to a question.
- GEO (generative engine optimization): helping content and entities be used and cited when generative AI composes an answer from several sources.
The comparison
| SEO | AEO | GEO | |
|---|---|---|---|
| Goal | Rank pages | Be the answer | Be included and cited in a generated answer |
| Typical output | A link in search results | A snippet, spoken answer or short AI answer | A synthesized paragraph, often with source links |
| Unit of competition | The page | The passage or fact | The source and the entity |
| Core techniques | Crawlability, relevance, content quality, links | Answer-first writing, question headings, explicit facts, formatting | Citable facts and quotations, entity consistency, corroboration, crawler access |
| Main surfaces | Google, Bing and other search engines | Featured snippets, voice assistants, AI Overviews | ChatGPT, Gemini, Perplexity, Claude, AI Overviews and AI Mode |
| Maturity | Decades of documentation and practice | Built on long-standing snippet and voice work | New; partly researched, largely still being learned |
| Measurement | Rankings, traffic, conversions | Snippet appearances, answer presence | Citations and mentions in AI answers (imperfectly measurable) |
How they relate: layers, not rivals
Think of the three as layers:
- SEO is the foundation. If content can't be crawled, indexed and trusted, nothing else matters. Google says that to appear as a supporting link in AI Overviews or AI Mode, a page must be indexed and eligible to show in Search with a snippet, with no additional special optimizations required.
- AEO shapes the content so the best passage is easy to identify and use as an answer.
- GEO strengthens the source: who you are, how consistently you're described and how widely your facts are corroborated, so that generative systems can use and cite you with confidence.
Most good practice serves all three at once. An answer-first paragraph helps a featured snippet, an AI Overview and a ChatGPT citation alike.
Where they genuinely differ
Unit of work
SEO thinks in pages and keywords. AEO thinks in questions and passages. GEO thinks in entities and sources: what the web as a whole says about you.
Off-site emphasis
SEO values links. GEO also values consistency and corroboration across many sources (listings, profiles, publications, reviews), because generative answers tend to reflect what multiple reliable sources agree on.
Measurement
SEO measurement is mature. AEO is partly measurable (snippets, some AI features). GEO measurement is immature: answers vary by user, phrasing and time, and tools can only sample them.
Evidence base
SEO practices rest on extensive documentation and experience. AEO builds on that. GEO draws on a smaller research base, notably the 2023 GEO paper, which found that adding citations, quotations and statistics tended to improve visibility in its benchmark, plus platform documentation and practitioners' tests. It's wise to separate verified facts from emerging theories.
What an AEO/GEO expert actually does
In short: audit how consistently an organization is described across the web, restructure key content so questions are answered first, make facts citable, decide AI crawler access deliberately, build genuine corroboration and monitor how AI assistants describe it. They don't promise AI recommendations or create content just to manipulate AI systems. How I approach this work for local businesses is set out in AEO and GEO expert for local businesses.
How to prioritize
| Situation | Priority |
|---|---|
| Pages aren't indexed or ranking at all | SEO fundamentals |
| Ranking well but rarely shown as the answer | AEO: answer-first rewrites, question headings |
| AI assistants describe you inaccurately or not at all | GEO: entity consistency, corroboration, crawler access, updated facts |
| Local business | Local SEO first (what is local SEO?), then AEO and GEO |
A local example
Take an independent veterinary clinic:
- SEO: service pages for vaccinations, dentistry and surgery that rank for local searches; a fast, crawlable site.
- AEO: a page answering "How often should a puppy be vaccinated?" with a short direct answer up front and detail below.
- GEO: consistent name, address, services and vet credentials across the website, Google Business Profile, directories and the local press article about its new surgery wing, so AI assistants can describe it accurately.
AEO and GEO for a local business: a layered checklist
Work top to bottom. Each layer depends on the one above it.
| Layer | Check | Done when |
|---|---|---|
| SEO | Key pages are indexed (check Google Search Console and Bing Webmaster Tools) | Every service page appears in the index |
| SEO | One page per core service, with the area served stated plainly | A customer can tell what you do and where from one page |
| Local SEO | The Google Business Profile is accurate and complete (optimization guide) | Name, category, hours, services and links match the website |
| AEO | The questions customers ask are answered in the first one or two sentences of a section | Each answer can be quoted on its own and still make sense |
| AEO | Facts are stated explicitly: prices or price ranges, areas, opening hours, credentials | No answer depends on reading between the lines |
| GEO | Name, address, phone and services are identical on the website, Business Profile, Apple Business Connect, Bing Places and key directories | Five sources say the same thing |
| GEO | Independent sources mention the business: local press, associations, genuine reviews (reviews strategy) | Someone other than you says what you do |
| GEO | Search-oriented AI crawlers are not blocked in robots.txt | You've decided deliberately which bots may visit |
| Measure | The same customer questions are asked of AI assistants each month (method) | Accuracy and mentions are tracked over time |
If you can only do three things this month, do the first three. AEO and GEO polish what SEO and local SEO establish; they don't replace them.
The takeaway
SEO gets you found, AEO gets you chosen as the answer, and GEO helps you be accurately represented when AI writes the answer. They're one strategy with three emphases. For the mechanics of how AI systems find and describe businesses, continue with how AI search engines discover and reference businesses.
Frequently asked questions
Do I need separate AEO, GEO and SEO strategies?
Usually not. One content and visibility strategy can serve all three, built on SEO foundations, with deliberate answer-first writing (AEO) and attention to entity consistency and citable facts (GEO).
What does an AEO/GEO expert do?
They make an organization's information clear, consistent and citable for answer engines and AI search: structuring content around questions, strengthening entity signals and structured data, managing crawler access, building corroboration and monitoring how AI systems describe the organization.
Which matters most for a local business?
Local SEO first, because it drives the map results and supplies the business information that answer engines and AI assistants rely on. AEO and GEO then shape how that information is used in answers.