A 404 page is the error page that users see when the page they’re looking for is not at the URL they’ve landed on. Some 404 pages are creative, some are useless, and some don’t even exist at all.
Users might land on a 404 page for various reasons – the page has been moved or deleted, they’ve followed a badly constructed link, or they may have typed in the wrong URL.
“Not Found” pages are more than just a nuisance, however, they may be losing you both visitors and SEO juice as well.
Is Your 404 Page Hurting You?