Indexing
The process by which a search engine stores and organizes a crawled page so it can appear in results.
Indexing is the step after crawling where a search engine analyzes a fetched page and stores it in its index — the database it queries to build search results. A page can be crawled but not indexed if the engine judges it low-value, duplicative, or explicitly excluded with noindex or a canonical pointing elsewhere.
Indexing is not guaranteed. Google decides what to keep based on content quality, uniqueness, and demand. This is why "submitted" in a sitemap does not mean "indexed" — the sitemap only helps with discovery.
Common reasons pages stay unindexed include thin or duplicate content, soft 404s, canonicalization to another URL, and crawl issues. To diagnose a specific page, use the URL Inspection tool in Search Console, which reports its exact index status and why.
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