404 Error
A 404 error is an HTTP status code indicating that the server cannot find the requested URL — the page does not exist. It is returned when a user or crawler requests a URL that has been deleted, moved without a redirect, or was never created. From a user experience perspective, 404s are dead ends that can frustrate visitors and damage site credibility.
From an SEO perspective, 404 errors become significant when pages with external backlinks return 404 — those inbound links no longer pass any equity, representing lost ranking potential. Crawlers reaching many 404s also waste crawl budget. The solution is to redirect deleted pages with backlinks to the most relevant live equivalent using a 301 redirect. Custom 404 pages that help users navigate to relevant content can mitigate UX damage for unavoidable 404s.
Why it matters for SEO
Broken pages that return 404 errors lose all inbound link equity they had accumulated, directly reducing ranking potential for the linked pages. Widespread 404s also impair crawl budget efficiency and signal poor site maintenance to search engines, potentially affecting overall site quality assessments.
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