Three acronyms. SEO, AEO, GEO. Describe three different jobs being done at three different surfaces. They overlap, they stack, and they often get conflated in agency pitches. This piece sorts them out cleanly so you can decide which work matters for your situation and which is being sold to you as a buzzword.
The one-line definitions
- SEO. Get your page ranked in Google's blue-link results.
- AEO. Get your page quoted as the direct answer in featured snippets, People Also Ask, and Google's AI Overviews.
- GEO. Get your brand recommended by name inside ChatGPT, Claude, Gemini, and Perplexity when a user asks a question in conversation.
SEO is the oldest of the three. AEO emerged with featured snippets around 2019 and matured with AI Overviews in 2024. GEO is the newest. The term was coined in a 2024 Princeton paper, but the work itself only became a real specialty when ChatGPT crossed 600M+ monthly active users and Perplexity started serving real recommendation queries at scale.
Different mechanism, different deliverable
The most useful way to hold these three is by the mechanism each one is optimizing for. They aren't just three flavors of the same work.
| Dimension | SEO | AEO | GEO |
|---|---|---|---|
| Surface | Google SERP organic results | Featured snippet, AI Overview, PAA, voice | ChatGPT, Claude, Gemini, Perplexity chat |
| Win condition | Rank in top 10 (top 3 for serious traffic) | Page is quoted directly | Brand is named/recommended |
| Unit of work | Page | Page section / structured block | Brand entity across web |
| Primary signals | Backlinks, on-page relevance, E-E-A-T | Schema, structured content, page-1 rank | Third-party citations, comparison presence, completeness |
| Measurement source | GSC, Ahrefs/SEMrush | GSC (limited), manual SERP audit | Direct LLM prompt audits |
| Time to results | 3–9 months | 1–3 months | 2–8 weeks |
How they actually stack together
Each layer requires the one below. Think of the stack like this:
Technical foundation → SEO → AEO → GEO.
You can't win GEO if Google can't even index your site (technical foundation). You can't win AEO without ranking in the top 10 organic (SEO). And you can't consistently win GEO if the third-party sources LLMs cite for your category don't mention you (off-page presence. Which AEO and SEO partly fund).
But the work compounds. A single well-built comparison page can:
- Rank #1 in Google for the buyer's comparison query (SEO win)
- Get pulled into the featured snippet for that query (AEO win)
- Get cited by ChatGPT when a buyer asks the conversational version (GEO win)
This is why the productized approach to GEO doesn't replace SEO. It sits on top. Most clients keep their SEO agency. GEO is the layer the SEO agency isn't equipped for, because the signals are different.
What changes for each layer
SEO: the foundational layer
SEO has gotten harder, not easier. Organic traffic on content-heavy sites is down 30–70% YoY in 2025–2026 because AI Overviews and ChatGPT have absorbed the top of the funnel. But SEO is still the foundation, because:
- Pages that don't rank in top-10 organic almost never appear in AI Overviews or featured snippets.
- LLMs that perform real-time web search (Perplexity, ChatGPT search mode, Gemini grounding) start their retrieval with a web search. Usually Google or Bing. Pages that don't rank don't get retrieved.
- The mechanics. Crawlability, schema, internal linking, backlinks. Still matter.
SEO advice that's suddenly more important in 2026: comprehensive content over fragmented blog posts, original data, clean semantic HTML, schema.org markup, and authoritative-source citations within your own content (which LLMs treat as a signal of trustworthiness).
AEO: the in-between layer
AEO targets surfaces where Google synthesizes or quotes an answer instead of just listing links. The mechanics:
- Direct answer in first 40–60 words. Featured snippets typically pull a 40–60 word paragraph that follows an H2 matching the user's query.
- Question-shaped headings. H2 should be phrased as a question the user might type.
- Structured data. FAQ schema, HowTo schema, definition boxes. These signal to Google what kind of answer the page contains.
- Top-10 ranking prerequisite. Google nearly always sources featured snippets from results already ranking in the top 10 for that query.
AEO and GEO overlap substantially. Structured content optimized for AEO often also gets cited by LLMs. The difference: AEO win = page is quoted; GEO win = brand is named. You can win one without the other.
GEO: the new layer
GEO is structurally different from SEO and AEO because the "ranking algorithm" isn't a stable ordered list. It's an LLM synthesizing from a set of sources at query time. The signals that move citation are:
- Semantic completeness. Does your page actually answer the whole question? LLMs prefer one comprehensive source over three fragmented ones.
- Third-party endorsement. Reddit threads, comparison articles, G2/Capterra/Trustpilot rows. These matter more for GEO than for SEO.
- Structural parseability. Schema, llms.txt, clean entity extraction. If the LLM can't cleanly identify your brand, it cites someone it can.
- Freshness. Heavy weight for time-sensitive queries. Stale pages lose to recent ones.
- Semantic uniqueness. If three sources say the same thing, LLMs pick the most authoritative. If one source says something the others don't. That source gets cited specifically.
- Authoritative quoting. Pages that themselves cite credible sources get cited more than pages that don't.
Which one do you actually need?
Depends on where your buyers research and where your competitors are winning.
- If your category is dominated by AI Overviews (e.g., consumer health, software comparisons, "best of" queries). AEO + GEO together. SEO alone won't produce traffic anymore.
- If your buyers ask AI engines for recommendations (B2B SaaS especially). GEO first. The buying decision happens in chat before your site is ever seen.
- If you're a content publisher relying on Google traffic. Defensive SEO + offensive GEO. The traffic mix is shifting fast and you need to be cited and ranked.
- If you're local single-location. None of the above first. Google Business Profile and local SEO drive most of the value.
What gets sold as "GEO" that isn't
Watch for these. They're common in agency pitches as of mid-2026 and don't actually move citation rate:
- "AI-optimized content" with no prompt-level measurement. If they can't show you the prompt set, citation rate, and per-engine breakdown. They're selling SEO content with new packaging.
- Schema-only audits. Schema is necessary but not sufficient. A schema-perfect site that no one cites is still invisible.
- AI Overview tracking branded as GEO. AI Overviews are a Google surface. That's AEO, not GEO. They overlap but aren't the same.
- "GEO ranking" reports. LLMs don't produce stable rankings the way Google does. Anyone showing you a ranked list of where you stand on ChatGPT is fabricating the metric.
The honest summary
SEO is still foundational. You can't skip it. AEO is a tactical layer most teams should already be doing. GEO is a new, addressable category specifically about brand recommendation behavior inside LLM chat. The work is measurable, the wins are visible, and the unit of measurement is citation rate on a fixed prompt set across multiple engines.
If you're looking at this stack from inside a mid-market company, the right move is usually:
- Audit where you currently stand across all three (SEO traffic baseline + AEO presence in AI Overviews + GEO citation rate on a buyer-prompt set).
- Identify which layer is your biggest gap vs competitors.
- Fund the layer with the highest expected lift first. Often that's GEO right now. Because the category is new, competition is thin, and the work compounds quickly.
That sequencing. Audit, prioritize, fund. Is how we think about every engagement. The goal isn't to sell you on one acronym. The goal is to move the metric that's actually moving buyer behavior in your category.