404 page – a page template displayed to users after a 404 error (when the URL is no longer available – the page has been deleted or the URL has been changed). It used to be that the 404 page was the same on every site. For some time now, administrators have been using personalization options. Such a page should relate to the content of the site, include useful navigational links, clearly and comprehensively explain what the error is caused by, and encourage people to stay on the site.
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