SEO targets rankings in normal search results. AEO targets direct answers such as featured snippets, People also ask and voice replies. AIO targets Google's AI-generated summaries. GEO targets mentions and citations in AI assistants such as ChatGPT, Gemini, Claude, Copilot and Perplexity. They share foundations: clear, trustworthy content, structured data, consistent facts and crawlable pages.
- Each acronym describes a different place where an answer appears.
- They overlap heavily; one strong content foundation serves all four.
- SEO remains the base because engines draw on indexed, relevant pages.
- AEO, AIO and GEO are newer and cannot promise guaranteed inclusion.
What does each acronym stand for?
SEO is search engine optimisation: earning visibility in the ordinary ranked results on Google and Bing. AEO is answer engine optimisation: being the passage chosen for a featured snippet, a People also ask box or a spoken answer. AIO is AI Overview optimisation: being cited in the generated summaries Google shows above results.
GEO is generative engine optimisation: being mentioned and cited by AI assistants such as ChatGPT, Gemini, Claude, Copilot and Perplexity. Notice that the labels are defined by surface, not by technique. The surface determines what the user sees and therefore what success looks like for each.
How do they differ in goal and measurement?
SEO is the most measurable: you can track rankings, impressions and clicks. AEO is partly measurable through snippet ownership and question visibility. AIO can be observed by checking which queries show a summary and who is cited, though results vary. GEO is the hardest to measure, because assistant replies differ by session and wording and often give no click data.
That difference should shape expectations. Judge SEO by traffic and enquiries, AEO and AIO by visibility and branded demand, and GEO by whether you are described accurately and mentioned for relevant questions, always alongside real business outcomes.
- SEO: rankings, clicks and conversions.
- AEO: snippet and question visibility.
- AIO: appearance and citation in AI summaries.
- GEO: accurate mentions across several assistants.
Where do the four overlap?
Almost everywhere that matters. All four reward pages that are crawlable, fast, specific and trustworthy. All benefit from direct answers under clear headings, accurate structured data and business facts that agree across your website and profiles. A page that explains something well for a human is the best raw material for each surface.
Because of this overlap, avoid creating separate content for each acronym. A single clear, expert page can serve ranking, a snippet, a summary and an assistant, provided it is structured so that each can extract what it needs.
Where do they genuinely diverge?
Differences show up in emphasis. SEO leans on links, technical health and keyword relevance. AEO leans on passage-level formatting. AIO leans on trust, experience and topic depth in the context of Google's systems. GEO leans on entity clarity, reputation across many sites and decisions about AI crawler access.
Assistants also vary in whether they search the live web. Some do for certain queries and some rely mostly on learned knowledge, which makes third-party mentions and consistent facts relatively more important for GEO. No outsider can fully map the internals, so stay with principles and test.
- SEO: technical health, relevance and authority.
- AEO: passage formatting and question coverage.
- AIO: trust and depth within Google's ecosystem.
- GEO: entity clarity, reputation and crawler decisions.
How should a business prioritise?
Start with SEO foundations, since indexed, relevant pages feed everything else. Then add answer-first editing, which pays off across AEO, AIO and GEO at once. Next, fix off-site facts and reputation, and decide your policy for AI crawlers deliberately.
Weight effort by where your buyers are. A local service business may gain most from listings and voice-friendly answers, while a B2B specialist may care more about being named when a manager asks an assistant for suppliers. Review the mix as buyer behaviour changes.
What is the honest summary?
SEO is mature; the other three are new and moving. None of them offers guaranteed placement, because the engines and assistants choose their own sources. Be wary of agencies that present four separate magic services with four invoices when one well-run content and technical programme covers most of the ground.
Keep your investment in work that is valuable under any scenario: accurate information, helpful and specific content, a fast and open site and an honest reputation. Add new surface-specific tactics only when you can see a clear reason.
Frequently asked questions
Do I need separate strategies for SEO, AEO, AIO and GEO?
Usually one integrated plan works better. The shared foundations cover most needs, with small surface-specific adjustments on top.
Is SEO dead because of AI?
No. Indexed, relevant pages still feed search results and often the AI features built on them. The mix of surfaces is changing, not disappearing.
Which one should a small business start with?
SEO fundamentals and local listings first, then answer-first content. Add AI-specific work as budget and evidence allow.
Can anyone guarantee results in AEO, AIO or GEO?
No. The platforms choose their own sources and change frequently, so guarantees are not credible.
How do I measure AI visibility?
Use a fixed set of realistic questions across assistants, log the answers over time and combine them with enquiry and branded search trends.
Need help with this? See our GEO — Generative Engine Optimisation service or talk to Yash Parikh.