What is the meaning of error 404?

A 404 error is often returned when pages have been moved or deleted. … 404 errors should not be confused with DNS errors, which appear when the given URL refers to a server name that does not exist. A 404 error indicates that the server itself was found, but that the server was not able to retrieve the requested page.

For More Information Please Refer: https://en.wikipedia.org/wiki/HTTP_404