AEO vs GEO vs SEO: what's the difference?

The short answer

SEO, AEO, and GEO are three overlapping disciplines that target three different search surfaces.

SEO targets the ten blue links that have run Google for two decades. The goal is to rank in those links for queries someone types into a search bar.

AEO, answer engine optimization, targets the direct-answer surfaces that have grown around traditional search. Featured snippets at the top of Google. Voice results from Siri, Alexa, and Google Assistant. The boxed answers that sit above blue links. The goal is to be the answer, not just one of ten options.

GEO, generative engine optimization, targets AI-generated answers from ChatGPT, Perplexity, Claude, Google's AI Overviews, and the wave of LLM-powered search experiences. The goal is to be cited inside the synthesized paragraph the AI returns, not to rank against it.

The three overlap heavily, then diverge on tactics. The next sections walk through what each one actually rewards.

SEO is still the foundation

SEO is the discipline most people mean when they say "search engine optimization." Optimize your pages for the queries your customers type, structure your site so Google can crawl and understand it, build links and authority signals over time, and rank in the blue-link results.

It is not dying. Google still serves around 8.5 billion searches a day. Even when AI Overviews appear at the top of the page, they pull from indexed content, which means traditional SEO drives the inputs that the AI answer depends on.

For a service business, SEO covers everything in the local search stack. Google Business Profile optimization. Schema markup so your business shows up correctly in maps and the local pack. Page speed and Core Web Vitals. Backlinks from local directories and trade associations. Reviews on the right platforms.

If your site does not have this foundation, neither AEO nor GEO will save you. You cannot get cited in an AI answer for "best foundation repair contractor in Portland" if your business is not in the index that AI engines pull from. SEO is the floor.

AEO, defined

AEO targets the answer surfaces that sit on top of, or beside, traditional search.

The most familiar example is the Google featured snippet, the boxed answer that appears at position zero on roughly 12% of Google searches. When someone asks "how long does foundation repair take," Google often shows a paragraph pulled from one specific page, with a link below. Being that page is AEO.

The second surface is voice. Siri, Alexa, and Google Assistant return one answer, not ten. Whoever wins the answer wins the query. For service businesses, voice queries keep growing, particularly for local searches. "Hey Siri, who is the best landscape architect near me?" returns a single name. AEO is how that name becomes yours.

The third surface is the People Also Ask block, the question-and-answer accordion that now appears on most informational queries. Each expansion pulls from a different page. Each one is an AEO opportunity.

The tactics are specific. Structure content as a question followed by a concise answer. Add FAQ schema markup. Lead each section with a direct, complete sentence that answers the heading. Use clear hierarchy, H2s phrased as questions, paragraphs that work in isolation. Avoid the long preamble that AI engines and Google snippets cannot extract.

The discipline rewards clarity over depth. A page that buries its answer in paragraph six rarely wins the snippet. A page that opens with a tight, complete answer often does, even when its overall content is shorter.

GEO, defined

GEO is the newer discipline. It targets the generative answers produced by ChatGPT, Perplexity, Claude, Google's AI Overviews, and other LLM-based search experiences.

When someone asks ChatGPT "what should I look for in a foundation repair contractor," ChatGPT does not return ten links. It returns a paragraph, sometimes citing two or three sources. The goal of GEO is to be one of those cited sources, or to be the source whose framing the AI absorbs even without an explicit citation.

The mechanics differ from SEO. AI engines do not just look at a single ranking page. They synthesize across many sources, weighted by signals that overlap with SEO but include some that do not.

What seems to matter most for GEO, based on the research published so far and the empirical patterns in Perplexity and ChatGPT search results:

Brand mentions across the open web. AI engines build a model of which businesses are credible by counting how often they get cited in independent contexts. A foundation repair contractor mentioned in five regional newspapers, three trade publications, and a Reddit thread is more likely to be cited than one mentioned only on its own site, regardless of which one ranks higher in Google.

Factual density. AI engines preferentially extract content that includes specific numbers, dates, dollar figures, and named entities. A page that says "foundation assessments cost $350 to $500 in the Portland metro" beats a page that says "we offer competitive pricing on foundation work."

Original data. Original research, original survey results, and proprietary data points get cited disproportionately because they are extractable as standalone facts.

llms.txt. A new file at the root of your domain that gives AI crawlers a curated map of your most important content. Adoption is still early but moving fast in 2026.

Schema markup, again. The same structured data that helps SEO and AEO also helps GEO, because it gives AI engines unambiguous facts to extract.

The actual difference

Pull the three disciplines apart at the goal level:

SEO wants to rank in the ten blue links. The win condition is a position number.

AEO wants to be the answer above or beside the blue links. The win condition is a featured snippet, a People Also Ask result, or a voice answer.

GEO wants to be cited inside the AI-generated paragraph. The win condition is brand mentions in synthesized responses.

The tactics that move each one differ:

SEO loves backlinks, on-page optimization, internal linking, and page authority. The signals are the ones SEO has rewarded for fifteen years.

AEO loves structured Q&A formatting, FAQ schema, concise direct answers at the top of every section, and content depth on a single specific question.

GEO loves brand mentions across the open web, factual density on the page, original data points, and unambiguous structured data. Backlinks help less than they do for SEO. Brand authority signals from a wide spread of independent sources help more.

A page can win all three at once. Our cost guide on this site, for example, ranks for "how much does a website cost for a service business" in traditional search, gets pulled into AEO surfaces for the cost question, and gets cited by Perplexity and ChatGPT when users ask about service business website pricing. Same content, three search wins.

Where they overlap

About 70% of the work that drives any of these three disciplines also drives the other two.

Page speed helps SEO ranking, AEO snippet eligibility, and GEO crawl efficiency.

Schema markup helps SEO rich results, AEO question targeting, and GEO factual extraction.

Clear hierarchy and well-structured headings help all three.

Real authority signals, named author bios, credentials, real address and phone number, original photography on the page, all help all three.

If your site does the foundational work well, you are 70% of the way to wins on all three surfaces. The remaining 30% is what separates a generalist site from one that consistently wins AEO snippets and GEO citations. That is where the discipline-specific tactics matter.

Why service businesses care now

For a service business, this conversation is not theoretical. The shift is happening.

ChatGPT has rolled out web search to every paid user and most free users. Perplexity has crossed 500 million queries a month and keeps growing. Google's AI Overviews appear on roughly 18% of US searches and the number rises every quarter. Voice queries through Siri and Alexa now make up around 20% of searches in some categories.

When a homeowner asks ChatGPT "best foundation repair contractor in Vancouver," they are doing what they used to do on Google. The difference is that ChatGPT names two or three contractors and gives reasons, instead of returning ten links and letting the user sort. The contractor named gets the call. The contractor not named gets nothing.

That dynamic is replacing the top of the funnel for a real and growing share of high-ticket service queries. Buyers researching $20,000+ projects increasingly run their first round of vetting through AI engines, then use Google for tactical follow-ups, then make the call.

If your business does not appear in the AI answers for the queries your buyers are running, you are losing market share to competitors who do. The first wave of GEO adopters will lock in citation patterns that compound over time, the same way the first wave of SEO adopters in 2003 to 2008 locked in search positions that took the next decade to displace.

This is a one-time window. It will not stay open.

Where to start

For a service business approaching all three from a standing start, the order matters.

Step one is the SEO floor. If your Google Business Profile is not optimized, your site is not loading in under 2 seconds, and you do not have schema markup on your service pages, none of the AEO or GEO work compounds. Spend the first 60 days here.

Step two is AEO. Add FAQ blocks to every service page and every guide. Use FAQPage schema markup. Restructure your H2s as questions. Open every section with a one-sentence answer. Most service business sites can pick up two to four featured snippets in 90 days from this work alone.

Step three is GEO. Start with llms.txt at your domain root, listing your hub pages and most authoritative content. Add original data to your guides, even if it is from your own client base, like "based on 80 foundation projects in Portland over the past five years." Pursue mentions in regional publications, trade associations, and industry directories.

Step four is measurement. AEO performance shows up in Google Search Console as featured snippet impressions and position data. GEO performance is harder to measure directly. Tools like Profound and Otterly track LLM citations. The simplest free check is to ask ChatGPT and Perplexity the queries your buyers actually run, and see whether your business name appears in the answer.

The whole sequence takes roughly six months to land the first wins. The compounding effect across all three disciplines is what makes the work worth the investment.

What to ignore

The market for AI SEO services is full of noise.

Vendors selling "AI SEO packages" at $5,000 a month with no methodology beyond what a competent SEO agency would do anyway. Tools that promise to "rank you in ChatGPT" by feeding their tool keywords. AI optimization scores that do not correlate with actual citations. SaaS dashboards that track LLM mentions without explaining how to influence them.

Most of this is repackaged SEO with a buzzword tax. The real work, the work that actually moves AEO and GEO results, is the same disciplined content and authority work that has always driven SEO, with the addition of structured Q&A and brand mentions across independent sources.

If a vendor cannot explain in plain English what they will change on your site to drive citations and snippets, they cannot do the work. If they pitch a "proprietary AI SEO algorithm" without showing you the actual tactics, they are selling a story.

The discipline is real. The vendor noise around it is mostly not.

The honest answer

SEO is not dying. AEO is mostly an extension of SEO with sharper structure. GEO is the new layer worth building toward, especially for service businesses whose buyers research expensive purchases.

Run all three. Sequence the work. Start with SEO foundations, layer AEO formatting, then build GEO authority signals across the open web. Six months in, the wins compound across surfaces. Twelve months in, you have a moat.

Do not pay anyone $5,000 a month to do something you can verify by reading their actual output. The work is concrete. The vendors who can do it can show their work.