What Is an error code 404?
Error 404 is a standard HTTP status code (also known as response code). Whenever an effort is made to access a URL or a server, the server returns a status code to indicate how the operation went. When the client can establish a connection with the server but cannot find the resource requested, it pulls out an error 404 status code. It essentially means that the page or whatever resource was requested cannot be found at that specific address. This is how a typical 404 error looks like: