The HTTP 404, 404 Not Found, 404, 404 Error, Page Not Found or File Not Found
error message is a Hypertext Transfer Protocol (HTTP) standard response code,
in computer network communications,
to indicate that the browser was able to communicate with a given server,
but the server could not find what was requested.
The error may also be used when a server does not wish to disclose whether
it has the requested information.
The website hosting server will typically generate a "404 Not Found"
web page when a user attempts to follow a broken or dead link;
hence the 404 error is one of the most recognizable errors
encountered on the World Wide

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The infamous error code of 404 is an error that represents File Not Found or Page Not found.

404 means the URL that you put is not found.

404 page not found