GEO, AEO, AIO: what are they and how do they differ from SEO?

GEO, AEO, AIO: what are they and what do they mean for your website?

Over the past few months, everyone has been talking about AEO, AIO and GEO. And let’s be honest, it’s easy to get lost.

We hear that SEO is “dead”, that AI is taking over, that Google is about to change everything.
In reality, it’s not that dramatic. It’s just a new chapter.

We don’t just type keywords into Google anymore.
We ask questions to ChatGPT, Perplexity or Gemini. And these tools don’t list links, they answer.

The result: ranking well is no longer enough to be visible. Your content has to be understood, cited and used by these AI tools.

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1. SEO isn’t dead, but it’s no longer enough

We all know SEO.
It’s what we’ve been doing for 20 years: keywords, tags, internal links, a bit of patience… and traffic.

The problem is that behaviour has changed. Today, 58.5% of Google searches in the United States and 59.7% in the European Union end without a single click to a website (SparkToro and Datos, 2024 study). And since then, Google’s AI Overviews answer more and more questions directly.

Search engines are no longer just indexes. They are becoming answer engines.

And those answers feed on your content.
Your articles, your pages, your data: everything you publish can be read, understood and summarised.

So yes, SEO remains essential. But if you want to keep existing in this new ecosystem, you need to think wider.

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2. AEO, AIO, GEO: what’s the difference?

These three ideas all say the same thing: we no longer talk only to Google, we also talk to AI.

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AEO: Answer Engine Optimization

AEO is the “answer engine” version of SEO.
The idea: when someone asks an AI a question, your content should be able to be part of the answer.

To get there, it needs to be:

• clear,
• well structured,
• easy to read and interpret.

Explicit headings, direct sentences, well-built FAQs.
In short: the clearer it is for a human, the easier it is for an AI to read.

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AIO: AI Optimization

AIO is the overall concept.
We’re no longer talking only about “ranking”, but about intelligibility.

AI tools like ChatGPT or Perplexity don’t “scroll” the web.
They analyse it, digest it, rephrase it.

If your content is up to date, reliable, structured and well written,
they understand it and can refer to it.

Put simply: AIO is what allows an AI to say “according to We-R…” in an answer.

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GEO: Generative Engine Optimization

GEO is optimisation for generative engines: ChatGPT, Perplexity, Gemini, Copilot or Google’s AI Overviews. The term comes from a research paper published in late 2023 by researchers from Princeton and IIT Delhi (Aggarwal et al., GEO: Generative Engine Optimization, presented at KDD 2024). In their tests, adding citations, statistics and sources to a piece of content increased its visibility in generated answers by up to 40%. It’s a benchmark result, not a guarantee, but it shows what AI tools value.

GEO also goes beyond your website: it’s the reputation of your content in the AI ecosystem.

These models learn by reading platforms like LinkedIn, Medium, Reddit or the trade press.
The more your ideas circulate there, the more you exist in their “collective memory”.

In short:

• SEO makes you visible,
• AEO makes you understandable,
• AIO makes you credible,
• and GEO makes you unavoidable.

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GEO vs SEO: how do you measure your visibility in AI?

SEO is measured in rankings and clicks. GEO is measured differently, because an AI doesn’t show a list of links but an answer.

The most reliable method is to track a fixed panel of prompts, meaning the questions your buyers actually ask: discovery questions, comparisons between providers, searches about your brand. You test them every week on the main AI tools and track three indicators:

• Citation rate: the share of answers in which your brand appears.
• Share of voice: your presence compared with your competitors on the same prompts.
• Cited sources: the pages and websites the AI relies on, including your competitors’.

At We-R, we use Peec AI and an in-house tool to track these citations, the results and our clients’ roadmaps. AI answers change from one day to the next: what matters is the trend over several weeks, not a single test.

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3. What this means for marketing teams

No need to reinvent everything, you’re already doing SEO.
You write articles, track your keywords, work on internal linking and backlinks.

All of that remains essential, but you need to broaden the strategy a little.

AI tools don’t work like Google. They don’t rely only on isolated keywords, they try to understand the overall meaning of a topic.

In practice, that means:
👉 Organising your content around topics rather than keywords.
One strong subject (the “pillar”) and, around it, articles that explain and complete it.

👉 Working on consistency between pages.
AI tools don’t read an article in isolation: they follow links and rebuild the logic of your website.

👉 Taking care of clarity.
Explicit headings, direct answers, short paragraphs.
Not to “keep it simple”, but so that your message is understood and reusable.

👉 And above all, updating regularly.
AI tools favour content that is recent, clear and alive.

In short: keep doing what you already do, but prioritise the meaning of your content over keyword stuffing.

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4. How to start the shift (without rebuilding everything)

We’re not going to rebuild your whole website overnight. But we can already lay the right foundations.

6 simple actions to start right now 👇

1. Make your content clearer
   → Simple sentences, explicit headings, a human tone.
2. Add FAQs to your key pages
   → Answer engines love them.
3. Update your articles regularly
   → AI tools favour recent content.
4. Cite your sources and authors
   → It’s a strong trust signal.
5. Be present beyond your website
   → LinkedIn, Medium, trade press, customer reviews: AI tools read there too.
6. Add an llms.txt file
   → It introduces your company and key pages to language models. You can create one with our free llms.txt generator.

The goal isn’t to revolutionise everything, it’s to make your content easier to read for everyone, humans and AI alike.

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5. Key takeaways

SEO isn’t disappearing, but it’s evolving.

We no longer talk only to Google, we also talk to the AI tools that answer our customers. And for that, you need content that is clear, structured and easy to understand.

In short:
👉 SEO gets you seen.
👉 AEO gets you understood.
👉 AIO gets you cited.
👉 GEO makes you exist in the long run.

It’s a new era for digital marketing. And the good news is that it finally rewards clarity over complexity or keyword stuffing.

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As a web agency, we already see the impact of AEO on how a website is built: architecture, content, structure… everything has to be designed for AI as much as for Google. If you want to know where your brand stands in ChatGPT or Perplexity, discover our SEO & GEO services.