GEO, AEO and SEO: what they are and how they differ

Ranking first on Google no longer guarantees people see you. Many searches are answered right at the top with an artificial-intelligence summary, and a good chunk of people never scroll down to the usual results. In that context, three acronyms have appeared that you may be getting pitched these days: SEO, AEO and GEO.

The short version: they're not the same thing, but they don't compete with each other either. They're layers that stack. Here we explain what each one is, how they really differ and what's worth doing today — with data, no hype, and separating what works from pure fear-marketing.

All three are after the same thing underneath: getting your brand to show up when someone searches for something you solve. What changes is where and how you show up.

• SEO (Search Engine Optimization): optimizing your site to rank in Google's list of results. Good old-fashioned SEO.
• AEO (Answer Engine Optimization): optimizing to be the direct answer — the featured snippet, the answer box, what a voice assistant reads out when someone asks something.
• GEO (Generative Engine Optimization): optimizing so your content is cited or included inside the answer an AI builds, like Google's summaries (AI Overviews), ChatGPT, Perplexity or Gemini.

The goal changes. In SEO you compete to appear first in the list. In AEO you compete to be the answer. In GEO you don't even compete for a spot: you compete to be inside the text the AI shows the user. As Semrush puts it, in GEO you're not fighting to rank at the top, you're fighting to be part of the final result.

There's debate here, and you're better off knowing it before someone sells you a "revolutionary discipline". One side —the academic paper from Princeton, presented at KDD 2024— treats it as a new paradigm. The other side, much of the industry, says it's SEO evolving alongside, not a replacement.

The truth? They overlap a lot. A site with solid SEO already has a head start on being cited by an AI. But new, measurable tactics do appear that we didn't used to watch. Our stance: treat it as one more layer of your SEO, not as something that replaces it.

This isn't futurism, it's already happening and it's measurable:

• When an AI summary appears on Google, the click to the first result drops sharply: between 34% and 58% fewer, according to Ahrefs measurements over 300,000 keywords across 2025.
• The Pew Research study, over nearly 69,000 real searches, found that with an AI summary present only 8% of people click a result, versus 15% when there's no summary. And barely 1% click a link inside the summary itself.
• Searches that end with no click at all went from 56% to 69% in a year (Similarweb data).
• At the same time, the use of AI tools for searching grew 70% year over year. And the market is spreading out: ChatGPT dropped from three quarters to a little over half of the traffic, while Gemini and others grow.

Translated: more and more people find their answer without visiting any site. If your brand isn't inside those answers, you're left out of that conversation.

Here we separate the proven from the hype. The Princeton study measured concrete tactics, and the three that moved the needle most were:

• Citing trustworthy sources within your content.
• Adding direct quotes from experts, with a full name.
• Adding statistics and concrete data, instead of vague claims.

Each one raised visibility by up to 30-40% in the experiment. An honest asterisk: that was measured in a lab environment with 2023-era engines, not on today's AI summaries. It's good evidence to guide you, not a guarantee.

Add to that the usual stuff, which still rules: content that answers real questions in clear language, well structured with headings and lists, clean HTML so the bots read it without hurdles, FAQ sections and brand authority (getting mentioned and cited elsewhere). None of this is new: it's good SEO, done with the awareness that an AI reads you too. Google itself says it: for AI search, the best strategy is still to create useful, trustworthy content, not to look for a trick.

• The llms.txt file: it caught on as "the way to talk to AIs". Google called it "purely speculative", and an Ahrefs study found that 97% of those files got not a single bot visit. It's useless today.
• Anyone who guarantees you'll get cited in ChatGPT or rank first in a Google summary. It can't be guaranteed: the engine decides that, not the agency.
• Tricks to "fool the algorithm". AI engines prioritize trustworthy sources; shortcuts don't last and can cost you dearly.

If you run a business and you're being pitched GEO or AEO, don't start with the fad. Start with what holds everything up:

• First, healthy SEO: a fast, well-structured site with content that answers what your customer is searching for.
• Citable content: clear guides, your own data and concrete answers to your industry's frequently asked questions.
• Authority: getting mentioned, cited and talked about beyond your own site.
• Measurement: tracking whether your brand shows up (and how) in AI answers, so you can adjust. Without measuring, you're guessing.

And a reality few tell you: almost all this data comes from the United States. In Argentina and Latin America the behavior may be different and there's still little local measurement. That's why we take it as an opportunity to get ahead, not as a closed formula.

At Gaucho we don't sell you GEO as a magic wand. We work it for what it is: one more layer of a well-built content and SEO strategy, with clear expectations and honest measurement. If you're being asked for it or want to understand how to apply it to your brand, take a look at what we do or get in touch and let's talk straight.