1. Crawling
A crawler discovers pages through links, sitemaps and other signals. If important content is blocked, inaccessible or hidden behind barriers, discovery may fail.
What Is SEO?
SEO helps search engines understand content and helps people discover pages that may answer their questions or meet their needs.
SEO definition
Search Engine Optimization, or SEO,
is the practice of helping search engines discover and understand content while making pages useful and accessible to the people searching for that information.
SEO is sometimes reduced to keywords or rankings, but it is much broader. It includes technical accessibility, page structure, content quality, internal links, reputation, user experience and the relationship between a page and the question being asked.
Google describes SEO as helping search engines understand content and helping users find a site and decide whether to visit it. That definition remains relevant as search results add AI-generated features.
How traditional search works
2. Indexing
The search engine processes the page and decides whether it is eligible to be stored in its index. Indexing is not automatic or guaranteed.
3. Serving results
When someone searches, systems evaluate relevance, quality, context and many other signals to decide which pages or features to show.
The main parts of SEO
Technical SEO
Technical SEO covers crawl access, indexability, site speed, mobile usability, HTTPS, redirects, canonical URLs, sitemaps and semantic HTML.
On-page SEO
On-page SEO includes titles, headings, visible text, internal links, image alt text, useful descriptions and content that clearly satisfies a search intent.
Local SEO
Local SEO connects a business with a real location or service area through a Google Business Profile, consistent business details, local relevance, reviews and location-specific content.
Authority and reputation
Search systems may consider links, mentions, expertise, reputation and whether other sources treat a site or organization as credible in its subject area.
Is SEO still important for AI search?
Yes. Google’s official guidance says SEO best practices remain relevant for AI Overviews and AI Mode. A page must be indexed and eligible for a normal Google Search snippet before it can appear as a supporting link in those features.
That does not mean every AI system works exactly like Google. It means the fundamental work of making content public, crawlable, understandable and useful is still essential.
GEO, AEO, AIO and REG may add useful ways of thinking about generated answers, direct answers and entity recognition. They do not remove the need for SEO.
SEO is the foundation. The newer disciplines add further questions: Can an answer system use the information? Can it recognize the correct entity? Can it retrieve the right facts? Can it explain them accurately?
Practical business example
Imagine a plumbing company serving Barrie and surrounding communities.
Weak SEO foundation
The website has one generic page, no clear service-area wording, no useful internal links, a vague title and important information available only after a script loads.
Stronger SEO foundation
The site has crawlable service pages, clear headings, visible contact details, useful local information, a maintained Google Business Profile and links connecting related services.
The stronger version is easier for both customers and search systems to understand. GEO or AEO work cannot reliably compensate for a site that cannot be crawled or indexed.
Common SEO mistakes
- Writing pages for keywords instead of answering real customer needs.
- Publishing many near-duplicate pages for every slight wording variation.
- Using titles and headings that do not accurately describe the page.
- Leaving important pages disconnected from internal navigation.
- Blocking crawlers accidentally through robots.txt, firewalls or bot protection.
- Using structured data that does not match the visible page.
- Assuming a technically valid page is guaranteed to rank.
Key sources
These references support the established definitions and technical explanations on this page.
- Google SEO Starter Guide — Official definition and practical SEO guidance.
- Google’s guide to generative AI features in Search — Why SEO remains relevant to AI Overviews and AI Mode.