GEO, AEO, LLMO, AI SEO - what these terms actually mean

GEO, AEO, LLMO, AI SEO, AISO - the discipline of being visible in AI answers is young enough that nobody agrees what to call it, and the acronym soup makes a fairly simple landscape look complicated. Underneath the five names, only two things are actually being optimized.

The terms, quickly

• SEO - Search Engine Optimization. The established discipline: ranking pages in classic search results. Still alive, still valuable - and increasingly, the input that AI systems draw on.
• AEO - Answer Engine Optimization. Optimizing to be the answer rather than a result: featured snippets, voice assistants, and now AI-generated responses. Emphasizes question-shaped content and structured data. The term predates the AI wave and is having a second life - searches for it have surged this year, so we gave it a full explainer of its own.
• GEO - Generative Engine Optimization. The term from a 2023 academic paper, now the most common name for optimizing brand presence in generative AI answers specifically - ChatGPT, Claude, Gemini, Perplexity.
• LLMO / AI SEO / AISO. Synonyms for GEO from different corners of the industry. No meaningful technical difference.

Two clocks, two disciplines

Strip the branding away and there are only two disciplines underneath:

1. Being retrievable

When an engine searches the live web to build an answer, do your pages get found, and are they quotable once opened? This is closest to classic SEO - crawlability, clear claims, structure, markup - and it moves on a fast clock: fix a page, and a retrieval-heavy engine like Perplexity can pick it up within days.

2. Being remembered

When a model answers from training data, does it know you exist? This is about presence in the corpus - reviews, comparisons, community threads, documentation. It moves on a slow clock measured in months, because nothing you publish today reaches the model until its next training run.

Does SEO still matter, then?

More than ever, but as a means as well as an end. The pages engines retrieve are disproportionately pages that already rank - AI search and classic search share infrastructure (ChatGPT's browsing leans on Bing's index, Gemini on Google's). Good SEO is now also GEO groundwork. What changed is the scoreboard: ranking #3 means little if the AI answer above the results names two competitors and not you.

What to call it

We say GEO because it's what our own users type - and because, building this tool in public, "generative engine" is the one part of the acronym soup that names the thing we watch all day. But don't let vocabulary consume strategy: pick the questions you need to win, measure where you stand engine by engine, and work both clocks. The full guide walks through the framework.

The name will settle on its own; your spot on the shortlist won't. See where you stand while everyone argues about the acronym.