Indexing
In one line
Indexing is the step where a search engine stores a crawled page in its database. If a page is not indexed, it cannot appear in search results at all.
Going deeper
Indexing is the step where the engine processes a crawled page and stores it in its database. More than half of 'why isn't my page ranking?' problems turn out to be an indexing problem, not a ranking one.
The fastest practical check is the URL Inspection tool inside Google Search Console. Messages like 'Discovered – currently not indexed' or 'Crawled – currently not indexed' usually point to content quality or duplication issues.
Indexing matters for GEO too. AI engines often run their own indexes, but staying inside Google's index keeps you eligible for AI Overviews and Gemini-powered answers.
Related terms
Crawlability
Crawlability is how easily a search engine bot can reach and follow your site's pages — the precondition for indexing.
SEOnoindex / nofollow
noindex tells search engines not to add a page to the index, while nofollow tells them not to follow a specific link — both are page-level robots directives.
SEOGoogle Search Console
Google Search Console (GSC) is Google's free tool for monitoring how a site performs in Search — impressions, clicks, indexing status and technical issues.
SEODuplicate Content
Duplicate content is the same or near-identical content living at multiple URLs, leaving search engines unsure which version should represent the page.
SEOMobile-First Indexing
Mobile-first indexing is Google's policy of using the mobile version of a page as the primary basis for indexing and ranking.
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