A noindex tag is an HTML meta directive that explicitly instructs search engines not to include a specific page in their index, meaning it won’t appear in search results even if the page is still crawlable and accessible.
Noindex tags are commonly used for pages that offer little search value, such as internal search result pages, thank-you pages, or duplicate content variations, helping focus a search engine’s attention on genuinely valuable, unique pages.
A critical technical SEO risk is accidentally leaving a noindex tag on important pages after a site launch or migration, which can silently remove key pages from search results entirely.
Noindex tag audits are a standard part of our Technical SEO service.