Summary: A 404 is a page that no longer exists, and a handful of them is normal on any site with history. They become a problem when they sit on pages people actually reach, when they are listed in your own sitemap, or when a rebuild moved every URL without redirects. This guide covers what a 404 actually costs you, how to find yours in Search Console and by crawling your own sitemap, when to redirect versus when to let a page die, and why a useful 404 page recovers visitors a default one loses.
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