That's all about error 404 "Page Not Found". By definition HTTP 404 is a standard response code meaning that your browser was able to connect to the server, but the requested page/file could not be located by it. Wikipedia provides a lot of information on this topic. For me (and I think others) the main purpose of creating custom 404 page - is search engine optimization. Why should I lose users who made a typo in URL or used an out-of-date link?
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