The short answer
SEO, or Search Engine Optimization, is the practice of making a website easier for search engines to find, understand and rank. It splits into four working areas: technical SEO (can the site be crawled and indexed), on-page SEO (does each page answer the query well), off-page SEO (do other sites vouch for you), and local SEO (does the business show up in map and near-me results).
What changed recently is the scope. Search now includes engines that answer directly rather than listing links, so the same discipline has grown two new branches: GEO and AEO. They are not replacements. They share the same foundation, because an engine that cannot crawl and parse your page cannot cite it either.
How SEO, GEO, AEO and AIO fit together
One umbrella, four branches, one place to actually do the work.
The four types of SEO
Most sites lose the most traffic to technical problems, because those suppress everything else. Fix in this order.
Technical SEO
Whether search engines and AI crawlers can reach, render and index your pages at all. The foundation. Everything else is wasted if this is broken.
- Crawlability and indexability
- Core Web Vitals, including INP
- Structured data and schema
- Sitemaps, robots and redirects
On-Page SEO
Whether an individual page actually answers the query it targets, and whether that is legible to a machine reading it.
- Titles, meta and headings
- Search intent match
- Content depth and E-E-A-T
- Internal linking
Off-Page SEO
Whether the rest of the web vouches for you. Still the hardest signal to fake and the one that separates similar pages.
- Backlinks and referring domains
- Anchor-text profile
- Link gap versus competitors
- Brand mentions
Local SEO
Whether a business shows up when someone searches near me, or asks an assistant for a recommendation in a place.
- Google Business Profile
- NAP consistency and citations
- Reviews and review velocity
- Location pages and local schema
Does SEO still matter if AI answers the question?
Yes, more than before. AI engines do not invent their sources. They pull from pages they can crawl, parse and trust, which are largely the same pages that rank on Google. A site with broken crawlability, thin content or missing schema fails on both boards at once.
The honest framing: SEO is the prerequisite, GEO is the upside. Fixing the foundation lifts both. That is why the audit covers them together rather than selling them as separate products. See the GEO guide for the generative half.
Frequently asked questions
What is SEO?
SEO, or Search Engine Optimization, is the practice of making a website easier for search engines to find, understand and rank. It splits into four working areas: technical SEO (can the site be crawled and indexed), on-page SEO (does each page answer the query well), off-page SEO (do other sites vouch for you through links and mentions), and local SEO (does the business show up in map and near-me results). In 2026 the term has widened to cover generative and answer engines too, so GEO and AEO now sit under the same umbrella.
What is the difference between SEO, GEO, AEO and AIO?
SEO is the umbrella. GEO, or Generative Engine Optimization, is about getting cited by ChatGPT, Gemini, Claude and Perplexity. AEO, or Answer Engine Optimization, targets direct answers like featured snippets and People Also Ask. AIO refers specifically to Google's AI Overviews, the AI answer that now sits above the classic blue links. They share a foundation: a site that cannot be crawled, parsed and trusted will fail at all four.
What are the four types of SEO?
Technical SEO covers crawlability, indexability, site speed and Core Web Vitals, structured data and mobile rendering. On-page SEO covers titles, meta descriptions, headings, internal links, content depth and search intent. Off-page SEO covers backlinks, referring domains, anchor text and brand mentions. Local SEO covers Google Business Profile, NAP consistency, citations, reviews and location pages. Most sites lose the most traffic to technical problems, because those suppress everything else.
Does SEO still matter now that AI answers questions directly?
Yes, and more than before. AI engines do not invent their sources. They pull from pages they can crawl, parse and trust. The technical and content foundations that make a page rank on Google are largely the same ones that make it citable by ChatGPT or surfaced in an AI Overview. A site with broken crawlability, thin content or missing schema fails on both boards at once. SEO is the prerequisite, not the alternative.
How long does SEO take to show results?
Technical fixes can move within days once pages are recrawled: indexation problems, broken canonicals and speed regressions often show up fast. Content and authority work typically takes eight to twelve weeks to compound, depending on domain strength and competition. AI citations sometimes move faster than rankings, because adding schema and answer-shaped content can change how an engine reads a page in a matter of weeks rather than months.
Can I do SEO without an agency?
Yes. The work splits into finding what is wrong, deciding what matters, and actually shipping the change. Most tools stop after the first two and leave the shipping to you, which is where teams without a dedicated SEO person stall. Raechal AI runs the audit, ranks the findings by impact and then publishes the approved fix into your CMS, so a founder can run the whole loop without hiring for it.