What is Indexing?

Before Google can rank a page, it must find it (crawling) and store a copy of its content in its search index (indexing). The index is a massive database — hundreds of billions of documents — that Google queries in milliseconds when someone performs a search. If a page isn't in the index, it simply doesn't exist in Google's search results, no matter how good the content is.

Several conditions must be met for a page to be indexed: the page must be crawlable (not blocked by robots.txt), it must not have a noindex meta tag (which explicitly tells Google not to index it), the page must return a 200 OK HTTP status code (not a 404 or 301 redirect), and it should ideally be linked from other pages (so Googlebot can discover it through link-following). Even with all conditions met, indexing can take days to weeks for new pages, and there's no guarantee Google will index every page it crawls.

Common indexing problems include: pages accidentally set to noindex (often by staging configurations copied to production), low-quality pages that Google deems not worth indexing, server errors that prevent crawling, and thin or duplicate content that Google chooses not to index. Google Search Console's Coverage report is the primary tool for diagnosing indexing issues.