SEO, AEO, GEO, AIO, SXO: a plain-English guide to the acronyms deciding which law firm gets found

If you have sat in a marketing update in the last year, you have been hit with the alphabet. SEO you know. Then someone says AEO. Someone else says GEO, then AIO, then SXO. A vendor email throws in LLMO for good measure. They all sound like the same thing wearing different hats, and nobody in the room wants to be the partner who asks what they actually mean.

So let me do the asking, and answer it, for the one industry I work in.

Here is the shape of it before we go deeper. SEO is being ranked in a list of links. AEO is being named in the AI's answer. GEO is being cited inside a generative AI's reply. AIO is the wider job of getting AI to know and trust your firm in the first place. And SXO is what happens once someone actually lands on your site. The first three are where your firm shows up. The last two are the work behind showing up, and the work after. For a law firm, the whole shift sits in one line: the game moved from ranking to being recommended by name.

The chart above shows how all five fit together, from the SEO foundation up to the moment your client sees your name. The rest of this walks through each one, with a real legal example, so the next time the alphabet comes up you are the person who gets it.

SEO: the one you already know

SEO is the discipline of the last twenty years: getting your firm's website to rank as high as possible in the list of blue links on a Google results page. A potential client searches "employment lawyer Dallas," sees a page of firms, and decides who to click. Your whole job was to sit high enough on that page to earn the click, and you measured it in rankings, clicks, and traffic.

It still works, and it is not going away. SEO is the foundation everything else is built on, because if the machine cannot read and trust your website, none of the newer letters will save you. But look at the assumption underneath it. SEO takes for granted that the client sees a list and makes the choice. That assumption is exactly the thing that is breaking.

AEO: Answer Engine Optimization

AEO is about being the firm that gets named when an answer engine responds to a question directly instead of handing back a list. The clearest example is the AI-written answer that now sits at the very top of a Google results page, the one that summarizes and names a few options before you reach a single link.

Run that same "employment lawyer Dallas" search today and it often opens with something like "three well-regarded firms are A, B, and C." If yours is not one of the three, the client may never scroll down to the links you spent years earning. So the thing you are measuring quietly changed. It stopped being where you rank and became something blunter: whether you are in the answer at all. The reassuring part is that most of AEO is just SEO done well, clean structure, clear answers to real questions, content a machine can lift and quote. This is the term we use at Selectio, because it names the real change. The client is not choosing from a list anymore. They are reading an answer, and the job is to be named in it.

GEO: Generative Engine Optimization

GEO is AEO's close cousin, pointed at the generative assistants themselves, ChatGPT, Perplexity, Gemini, Claude. The term comes out of Princeton research from 2023, and it describes optimizing so a model cites and recommends you inside its reply.

Here the client skips Google entirely. A general counsel opens ChatGPT, asks "who handles complex employment disputes in Dallas," and gets back a short recommendation naming a few firms with links that explain the picks. Earning a place in that reply is a different craft than ranking a webpage, because the model is not reading your site so much as the world around it: legal directories, bar publications, reported decisions, the occasional community thread. What you are really tracking is share of voice, how often you get named against how often your competitors do.

AIO: AI Optimization

AIO is the widest of these terms, and honestly the most useful way to hold the rest. It is the work of getting AI systems to know your firm and trust it enough to cite it, which comes down to two moves: get mentioned on authoritative sources, and rank well in search. For a law firm that means showing up, accurately and consistently, in the places these models lean on, the legal directories, the bar publications, Law360 and JD Supra, reported decisions, and your own well-structured site. Seen this way, AEO and GEO are specific slices of AIO. AIO is the whole effort to become a source the machine reaches for.

One word of warning, because the acronym is overloaded. Some people use AIO to mean Google's "AI Overviews," the answer box itself, rather than the discipline of optimizing for AI. Same three letters, different thing. When someone says AIO, check whether they mean the work or the feature.

SXO: Search Experience Optimization

SXO is the one with nothing to do with AI and everything to do with not wasting the work above. It is about the experience once someone actually lands on your site: whether it loads fast, reads clearly, and lets a prospect find the right practice and book a consultation without friction.

This matters more now, not less. When a client arrives through an AI answer, they often show up half sold, because the model already told them you were worth a look. SXO is making sure your site closes what the answer opened, instead of losing a ready client to a slow page or a contact form buried three clicks deep.

So how do these fit together?

It helps to stop seeing them as rivals. SEO is the foundation, still how a machine reads and trusts a website at all. AEO and GEO are how you show up when AI answers a question, in Google's answer box and inside the chatbots. AIO is the broader campaign to become a source AI cites in the first place. And SXO is what happens after the click, turning the visitor an answer sent you into an actual consultation. Five names, one job: be the firm AI recommends, and be ready when the client arrives.

That also clears up the question people tie themselves in knots over, whether AEO and GEO are the same thing. They overlap so heavily that plenty of vendors use the words interchangeably. The fine distinction: AEO is being the answer anywhere an engine answers directly, including Google's answer box and featured snippets, while GEO is specifically about being cited inside generative replies. We use AEO as the umbrella. If a vendor says GEO, they usually mean the same thing.

The rest of the alphabet, quickly

You will bump into a few more, so here they are without the mystery:

• LLMO (large language model optimization), sometimes "LLM SEO": really just GEO by another name, structuring content so models understand and cite it.
• GAIO and "AI SEO": looser labels for the same shift, used more in headlines than in practice.
• "Search Everywhere Optimization": a catch-all for the idea that you now need to show up across every surface at once, not just Google.

Do not let the soup intimidate you. Almost all of it circles a single idea: being the answer an AI gives, not just a link a person clicks.

Why this lands harder on law firms

Two things make legal feel this faster than most industries. The first is simply that legal questions are the kind AI loves to answer directly. When Semrush studied more than ten million keywords across 2025, law and government were among the categories where AI answers rose the most, because the questions your clients ask are so answerable.

The second is subtler, and it is where generic advice falls apart. A law firm is not one brand. AI reads you on three layers: the firm, the practice, and the individual lawyer. A client might ask about your firm, or about the best securities litigators in New York, or about one partner by name. You can be named on one layer and completely invisible on the other two. An off-the-shelf tool that scores a single brand misses most of that picture, which is the whole reason this has to be built for legal to be worth anything.

What to do with this

Do not read any of this as "SEO is dead, panic." Read it as a change in the question. For twenty years the question was whether you rank. That is now just the floor. The question that decides whether your firm is even in the conversation is whether you are named: when a client asks an AI for a firm like yours, are you in the answer, and are you cited across the sources that answer is built from.

If you are not sure, you can find out in about two minutes. Open ChatGPT, or Google's AI answer, and ask the question your best client would ask. See whose names come back. If yours is not one of them, you have just seen the gap this whole alphabet is really about.

Sources: Semrush, analysis of more than 10 million keywords (legal AI Overview trigger rate); Princeton University, "GEO: Generative Engine Optimization" (2023). AEO, GEO, AIO, and SXO definitions reflect Selectio's working framework for law firms.

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