The HTTP error 404, or more commonly called “404 error”, means that the page you are trying to open could not be found on the server. This is a client-side incident which means either the page has been deleted or moved, and the URL has not been modified accordingly, or that you have misspelled the URL.
The HTTP 404, 404 Not Found, 404, 404 Error, Page Not Found, File Not Found, or Server 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 Web.