The 404 or Not Found error message is a HTTP standard response code indicating that the client was able to communicate with the server but the server could not find what was requested. 404 errors should not be confused with "server not found" error, in which a connection to the destination server could not be made at all.

The 403 Forbidden HTTP status code indicates that the client was able to communicate with the server, but the server won't let the client access what was requested.

Let’s have some Pictorial representation of page not found error.Hopefully clicking the below hyperlink will not result in 404.

http://jedi-star.com/index.php/coolestcollection-of-404-error-images/