Code 404

HTTP 404 (Not Found) is a client error response code indicating that the server cannot locate the requested resource. In SEO, 404 errors can signal broken internal links, improperly managed URL changes, or deleted pages that still have external backlinks pointing to them, causing lost link equity.

HTTP 404 errors are identified through Google Search Console's Coverage and Crawl Errors reports, Screaming Frog SEO Spider, and Ahrefs' broken links audit. SEOs typically resolve 404s by implementing 301 redirects to relevant live pages or restoring the deleted content.