# SEO vs. GEO vs. AIO vs. LLMO: The Differences on One Page > SEO, GEO, AIO, LLMO, AEO: what do they actually mean? This beginner guide sorts them on one table by where you want to appear and how you measure success, using Google's official guidance on AI features. | Field | Value | |-------|-------| | Published | 2026-10-13 | | Category | Beginner | | Author | Aro Ogata | | Tags | beginner, SEO basics, SEO, GEO, AIO, LLMO, AEO, AI search | | URL | https://linksurge.jp/blog/en/seo-geo-aio-llmo-differences/ | --- ## Key Takeaways: Four (or Five) Names, One Foundation "Is SEO dead? Should we be doing GEO now?" "Our agency just pitched us LLMO." Since AI search took off, the acronyms have multiplied. I've been asked "which one is the real one?" more times than I can count. Here's the short version. 1. **The difference is where you want to show up** — SEO targets the list of links on a search results page. AIO targets the AI answer inside Google Search. GEO and LLMO target AI answers in tools like ChatGPT and Perplexity. Same craft, different venues 2. **What changes is how you measure success** — SEO is measured in rankings and clicks. AI-focused work is measured by whether an AI answer cited your page or mentioned your brand. That's the practical difference that matters most 3. **Google says optimizing for AI features is still SEO** — Google's official guide states that work people call "AEO" or "GEO" is, from Google Search's perspective, still SEO. There are no extra requirements to appear in AI Overviews 4. **Beginners should start with SEO fundamentals** — Get found, get read, answer the question. If that foundation is missing, no acronym will save you Let's break each of these down. --- ## 1. The Acronyms in Plain English Start with what each letter stands for. With acronyms, knowing the full name gets you halfway to the meaning. ### What is SEO (Search Engine Optimization)? SEO is the work of getting your pages to appear in search engines like Google and Bing, and getting people to click them. Google's own SEO Starter Guide describes it as helping search engines understand your content, and helping users find your site and decide whether to visit. That covers writing clear content, making pages readable by machines, and earning links from other sites. ### What is AIO? AIO is the slippery one. People use it in two ways. - **AIO as AI Overviews optimization** — getting your page cited in the AI-generated summary at the top of Google's results - **AIO as "AI optimization"** — a catch-all label for any work aimed at showing up in AI answers On the LinkSurge blog, we use AIO in the first sense: optimizing for the AI answers inside Google Search. If someone says "AIO" in a meeting, ask which one they mean. It saves a surprising amount of crosstalk. ### What is GEO (Generative Engine Optimization)? A generative engine is a search tool that writes an answer in prose instead of returning a list of links. ChatGPT, Perplexity and Gemini are the usual examples. The term was popularized by a research paper titled "GEO: Generative Engine Optimization," first posted in November 2023 and later accepted to KDD 2024. The paper frames GEO as helping content creators increase how often and how prominently their content appears in generative engine responses. ### What is LLMO (Large Language Model Optimization)? A large language model (LLM) is the type of AI that powers tools like ChatGPT. It has learned from enormous amounts of text. LLMO means making your content more likely to be cited or mentioned in LLM outputs. Conductor's glossary calls it "essentially synonymous" with GEO. In my experience, which one people use mostly depends on which vendor or newsletter they read first. ### And AEO? You'll also see AEO, short for Answer Engine Optimization. In practice it's used much like GEO, and Google's own documentation mentions the two side by side as labels for work focused on AI search visibility. For a deeper look at LLMO specifically, see "[What Is LLMO? Complete Beginner's Guide](/blog/en/llmo-guide-beginners-2026/)." > References: > [SEO Starter Guide - Google Search Central](https://developers.google.com/search/docs/fundamentals/seo-starter-guide) > [GEO: Generative Engine Optimization - arXiv](https://arxiv.org/abs/2311.09735) > [LLMO (Large Language Model Optimization) - Conductor](https://www.conductor.com/academy/glossary/llmo-large-language-model-optimization/) --- ## 2. The One-Page Comparison Now for the main event. Compare these terms on two axes, where you want to appear and how you measure success, and the confusion clears up fast. | Term | Full name | Where you want to appear | How you measure success | |:--|:--|:--|:--| | SEO | Search Engine Optimization | The list of links on Google, Bing and other search results | Rankings, impressions, clicks | | AIO | AI Overviews optimization (or "AI optimization") | AI answers inside Google Search (AI Overviews, AI Mode) | Whether you're cited, and in what position | | GEO | Generative Engine Optimization | AI answers in ChatGPT, Perplexity, Gemini and others | Whether you're cited or mentioned, and how often | | LLMO | Large Language Model Optimization | Roughly the same as GEO | Roughly the same as GEO | | AEO | Answer Engine Optimization | Often used the same way as GEO | Often used the same way as GEO | Think of it like a farmer selling the same produce to different restaurants. The prep work is identical. Only the buyer changes. ### What do they have in common? Every one of these terms rests on the same four basics. 1. **Machines can reach your page** — you aren't blocking crawlers, and other pages link to it 2. **Machines can read your page** — the important information is in text, and headings make the structure clear 3. **You answer the question directly** — the reader gets what they came for without digging 4. **It's clear you're a credible source** — who wrote it and what it's based on are visible How search engines find and read pages is the subject of the next article in this series, "[How Search Engines Work](/blog/en/how-search-engines-work/)." ### What's actually different? Measurement. In SEO, you ask "what position am I in?" and "how many clicks did I get?" In AI answers, ranking positions don't map neatly. You need to count whether the AI cited your page as a source (a citation) or named your brand in the answer (a mention). Here's the thing that tripped me up early on: ranking #1 doesn't mean you'll be the source an AI answer cites. That happens all the time. So you need a separate habit of checking AI visibility, alongside rankings. Tools like [LinkSurge](https://linksurge.jp/) record rankings and AI citations separately. Search Console, plus a range of AI visibility trackers, cover parts of the picture too. Most teams combine a few. --- ## 3. What Google Officially Says About "AI Optimization" Let's check this framework against Google's own documentation. The question beginners worry about most is whether AI needs a completely separate playbook. ### No special requirements for AI Overviews Google's "AI Features and Your Website" page says there are no additional requirements to appear in AI Overviews or AI Mode, and no other special optimizations needed. It states that SEO best practices remain relevant for AI features. That assumes you haven't opted out with Search Console's Search generative AI control. Sites are included by default; if you exclude yours, it stays in regular Search but no longer appears in AI Overviews or AI Mode (rolled out to all sites on August 31, 2026). The basics it highlights include: - Allowing crawling in robots.txt (the file that tells crawlers what they may access) - Making content easy to find through internal links - Putting important content in text form - Keeping structured data (machine-readable labels for your content) consistent with what's visible on the page ### "GEO and AEO are still SEO" Google's guide to optimizing for generative AI features on Google Search (checked October 2026) goes further. It answers "is this still SEO?" with a plain yes. It says work labeled "AEO" or "GEO" is, from Google Search's view, optimizing for the search experience. The same guide says you don't need to break your content into tiny chunks for AI. It also says llms.txt files won't help or hurt your visibility in Google Search. One caveat. That's Google talking about Google. ChatGPT and Perplexity are different products from different companies, and their systems aren't necessarily the same. Treating Google and other AI tools as separate targets is a useful habit. For the broader impact of AI search on SEO, see "[AI Search Impact on SEO](/blog/en/ai-search-seo-japan-2026/)." > References: > [AI Features and Your Website - Google Search Central](https://developers.google.com/search/docs/appearance/ai-features) > [Search generative AI control - Search Console Help](https://support.google.com/webmasters/answer/16908024?hl=en) > [Google's Guide to Optimizing for Generative AI Features on Google Search - Google Search Central](https://developers.google.com/search/docs/fundamentals/ai-optimization-guide) --- ## 4. Common Misconceptions and Mistakes More buzzwords, more ways to go wrong. Here are five traps I see beginners fall into. ### Myth 1: "SEO is dead. Switch to GEO." You don't switch. AI-focused work sits on top of SEO fundamentals, as Google itself says. A page search engines can't find is also less likely to show up in AI answers. ### Myth 2: "AI needs special files and formatting." For Google Search, Google says llms.txt and chopping content into chunks aren't needed. A common failure looks like this: a team spends weeks on AI-specific files while their actual articles go stale. That's the order backwards. ### Myth 3: "Each acronym needs its own team and budget." Splitting "SEO people" and "GEO people" who send conflicting instructions about the same pages creates chaos. The foundation is shared. Fix the basics as one team, then split only the measurement. ### Myth 4: "GEO means geographic targeting." In AI search conversations, GEO means Generative Engine Optimization. Ranking in maps and location-based results is usually called local SEO. Make sure everyone in the room means the same thing. ### Myth 5: "If AI cites me, rankings don't matter." Google's AI features page says that to be eligible, a page must be indexed (stored in Google's database) and eligible to appear with a snippet (the text description in results). Abandon search fundamentals and you narrow the path into AI answers too. --- ## 5. How to Check Your Own Site Once the terms make sense, check where your site actually shows up. There are three places to look. 1. **Rankings** — where you appear in search results for your target keywords 2. **AI answers inside Google** — whether an AI Overview appears for that keyword, and whether your page is cited 3. **AI answers in ChatGPT and similar tools** — whether your brand or pages come up when you ask relevant questions For the second, LinkSurge's [AIO optimization analysis](https://linksurge.jp/aio-v5) shows what an AI Overview contains and which sources it cites, keyword by keyword. If you're checking by hand, search in a logged-out browser window to reduce the influence of your personal history. For the third, AI answers vary from run to run, so never judge from a single response. If you want regular tracking, a tool like LinkSurge's [GEO monitoring](https://linksurge.jp/geo) records mentions across multiple AI tools on a schedule. For hands-on tactics, see the "[Complete GEO Guide](/blog/en/geo-guide-japan-2026/)." --- {{linksurge-card}} ## Quick Check ### Q1: What's the biggest difference between SEO and GEO? Answer: Where you want to appear and how you measure success. SEO looks at rankings and clicks in a list of links; GEO looks at whether AI answers cite or mention you. ### Q2: Does Google say you need special optimization to appear in AI Overviews? Answer: No. Google says there are no additional requirements or special optimizations, and that SEO best practices still apply. ### Q3: Your boss says "let's do AIO." What should you ask first? Answer: Whether they mean AI Overviews optimization or AI optimization in general. The term means different things to different people. --- ## Frequently Asked Questions ### Which should I start with: SEO, GEO, AIO or LLMO? Start with SEO fundamentals. Making pages findable and readable by search engines, and answering readers' questions directly, is the shared foundation for every one of these terms. Add AI visibility tracking once that's in place. ### Are GEO and LLMO the same thing? They're used almost interchangeably. Both describe getting your content cited or mentioned in AI answers from tools like ChatGPT and Perplexity. Neither has an official definition, so scope varies slightly by who's using the term. ### Do I need llms.txt to appear in AI Overviews? No. Google's official guide says Google Search doesn't use llms.txt and that it neither helps nor hurts visibility or rankings. Keeping one for other AI services or agents is fine, but it isn't a priority for Google. ### How can I tell whether an AI answer cited my site? For Google, search the keyword and check the source links in the AI Overview, or use a tool that records AI Overview citations. For ChatGPT and similar tools, answers change between runs, so ask the same questions on a regular schedule and judge by the trend. --- ## Conclusion: Think in Terms of Venue and Measurement Next time a new acronym lands in your inbox, ask two questions. Where does it want you to appear? How does it measure success? Almost every term fits somewhere on the table above. The order of work is simple. Get the search basics right first. Then track rankings and AI visibility as separate numbers. The foundation is shared, so there's no need to pick just one. Up next in this series: "[How Search Engines Work: Crawling, Indexing and Ranking](/blog/en/how-search-engines-work/)." For the full reading order, start at the "[SEO, GEO and AIO Beginner Curriculum](/blog/en/seo-beginner-curriculum/)," and keep the "[SEO Glossary for Beginners](/blog/en/seo-glossary-beginners/)" handy. To see where AI search fits into three decades of SEO, read "[How SEO Changed](/blog/en/seo-history-keywords-to-ai-2026/)." LinkSurge's [GEO monitoring](https://linksurge.jp/geo) tracks how ChatGPT and other AI tools mention your brand over time.