Noindex is a directive that tells search engines not to include a page in their index, so it will not appear in search results. It is delivered either as a meta tag in the page's HTML head () or as an X-Robots-Tag HTTP header.
Definition
Noindex is a directive that tells search engines not to include a page in their index, so it will not appear in search results. It is delivered either as a meta tag in the page's HTML head (<meta name="robots" content="noindex">) or as an X-Robots-Tag HTTP header.
Crucially, for the directive to be seen, the page must be crawlable — a URL blocked in robots.txt is never fetched, so its noindex tag is never read, and the URL can still appear in results as a bare link.
Noindex is the right tool for pages that have a purpose for users but no value in search: internal search-results pages, thin tag or filter archives, thank-you and confirmation pages, login and account pages, paginated pages beyond the first where the set is better represented by the hub, and staging or duplicate content that must stay live but out of the index. It differs from canonical, which consolidates duplicates, and from robots.txt disallow, which blocks crawling but not indexing.
In context
On an iGaming affiliate site, noindex is commonly applied to faceted-filter combinations that would otherwise flood the index with near-duplicate list pages, to author or date archives with no unique content, and to utility pages. A frequent pattern is to allow page one of a paginated series to be indexed while noindexing pages two and beyond, keeping the hub as the ranking target without losing crawl access to the deeper items linked from those pages.
Mistakes with noindex are costly because they are silent. Accidentally noindexing a whole section during a template change, leaving a noindex on a page that was migrated from staging, or combining noindex with a canonical pointing elsewhere (which sends conflicting signals) can remove important pages from search for weeks.
After deliberately noindexing pages, it is also worth eventually adding follow so link equity still flows, and — for pages meant to leave the index permanently — some teams later block them in robots.txt only once they have been dropped, never before.
Worked example
An affiliate applies <meta name="robots" content="noindex,follow"> to every internal search-results URL and to filter combinations beyond a curated whitelist. The site's indexed page count drops from 40,000 to 6,000 over a month, crawl budget concentrates on the pages that matter, and rankings for the core reviews improve.
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