GEO, AEO, LLM SEO and AI SEO: What Each Term Means

GEO, AEO, LLM SEO and AI SEO are four labels for overlapping work: getting your business cited and recommended inside AI-generated answers. AEO is about being the answer an engine gives. GEO narrows that to generative AI engines. LLM SEO names the technology underneath. AI SEO is the loosest of the four and sometimes means something else entirely. The tactics barely change between them. The labels do.

If you have sat in a marketing meeting where someone said "GEO" or "LLM SEO" and the room nodded along in uncertain silence, you are not alone. The acronyms have multiplied faster than the tactics, and even experienced marketers are unsure whether they need a new strategy or are hearing familiar advice under a new name. The short answer is a bit of both. This post is the glossary: what each term means, how they relate, and which one to use.

What does each term mean?

AEO: answer engine optimization

An answer engine is any tool that responds to a question with one synthesized answer instead of a list of links. AEO is the work of making your content one of the sources it quotes. It is the broadest of the AI-era terms. It covers ChatGPT, Perplexity and Google's AI Overviews, and also the older answer formats: featured-snippet-style answer boxes and voice assistants that read out a single reply. I explain AEO properly, including how it differs from SEO, in What is AEO?

GEO: generative engine optimization

GEO is optimizing for visibility inside generative AI engines specifically: ChatGPT, Perplexity, Gemini and Google's AI Overviews. The goal is to appear in the AI-written response, not just the blue links beneath it. The term is favored by academics and by AI visibility tools, so you will often meet it in research and in software dashboards. In practice GEO is a near-synonym for AEO with a narrower focus on generative engines.

LLM SEO (and LLMO)

LLM SEO describes the same goal from the technology angle. Large language models are now part of the search stack, so the question becomes how to get your brand, content and expertise into what they produce. You may also see it written as LLMO, large language model optimization. People who use this term tend to think about how a model learns about a brand, both from what it was trained on and from the pages it retrieves live, rather than about any one product.

AI SEO

AI SEO is the loosest term and the one most likely to cause confusion, because it has two meanings. Sometimes it means optimizing for AI search, the same work as AEO or GEO. Other times it means using AI tools to do SEO, such as drafting content or grouping keywords. If someone offers you "AI SEO", ask which one they mean. One changes how AI talks about your business. The other is a way of producing work. If it is the first one you need, here is what hiring an AI SEO consultant for a small business looks like.

AI search optimization

The plain-English umbrella for all of the above. It is the name of our AI search optimization guide and service, because business owners understand it without needing an acronym explained.

How do GEO, AEO and LLM SEO relate to each other?

They describe overlapping work with different emphasis. The distinctions are real but narrow, and the tactics that serve one generally serve all of them. We have several names instead of one partly because different vendors coined their own terminology, and partly because "GEO" and "AEO" are now real search queries with real commercial intent. Buyers type them, so the industry uses them.

Term	Stands for	Emphasis	Use it when
AEO	Answer engine optimization	Being the answer any engine gives: AI chat, AI Overviews, answer boxes, voice	Explaining the discipline and writing about it
GEO	Generative engine optimization	Visibility in generative AI engines specifically	Reading research, using AI visibility tools, or talking to people who already use it
LLM SEO / LLMO	Large language model optimization	How language models learn about and describe your brand	Talking with technical or product teams
AI SEO	Depends who is speaking	Either AI search visibility or SEO done with AI tools	Only once you have agreed which meaning you intend
AI search optimization	Umbrella term	The whole practice, in plain English	Talking to business owners and non-marketers

Where does traditional SEO fit?

Underneath all of them. Every one of these terms sits on top of SEO rather than replacing it. High-quality content that answers real questions, a consistent NAP (name, address, phone) across local directories, backlinks from authoritative sources and a technically healthy website are still the foundation. No GEO strategy will help a thin, untrustworthy site show up anywhere, in AI answers or in traditional results.

Which term should you use?

Use the term your audience already uses. My rule of thumb:

• Talking to a business owner: say "AI search" or "getting recommended by AI". Nobody needs an acronym to understand the goal.
• Writing a page or a post: use the words your buyers search for. AEO and GEO are both searched, so it is reasonable to name both on a page about the topic, as long as you define them.
• Briefing a team or writing a strategy: pick one term and use it consistently. I use AEO as the main term and write AEO/GEO where it helps people searching for either.
• Reading a tool report or a research paper: expect GEO, and read it as the same work.
• Hearing "AI SEO" in a sales pitch: ask whether they mean visibility in AI answers or content produced with AI.

If you are hiring for this work, here is what a generative engine optimization consultant does.

Is GEO a different strategy from AEO?

No. Whatever the label, the work is the same: answer-first content, accurate structured data, a business described consistently across the web, visible expertise and credentials, and AI crawlers allowed to read your site. Some of that carries more weight than it did before AI answers arrived, entity consistency and answer-first writing in particular. But you do not need a GEO plan and a separate AEO plan. One plan serves traditional search and AI search together, because both are trying to find trustworthy sources that clearly answer the question.

When I audit a business for AI visibility, I run one audit, not one per acronym. It covers content structure, schema, entity consistency and credentialing gaps alongside the SEO basics. For how each of those works, read What is AEO? and the step-by-step guide to ranking in AI search.

Why does the vocabulary matter if the tactics overlap?

Even if GEO and AEO are largely the same idea under different names, buyers search for them, so you need to know them to find the right help. If you ask an agency how to appear in ChatGPT answers and they have never heard of GEO or AEO, that is a signal. The vocabulary tells you whether someone is working in the current landscape or the previous one. It belongs on your list of questions to ask an SEO agency.

If you want to see where your business stands in both traditional search and AI answers, start with my AI Visibility Checklist or request a free audit. If you would rather talk it through for your site, get in touch.