What are 404 errors?

[SkillPTP]

Error 404 is Hypertext Transfer Protocol standard response code. HTTP 404 page appears when a web page couldn't find him on the server or it`s a client-side Error which means the page has been removed or moved, or that you typed in the URL incorrectly.

[jonny deep]

This HTTP error is passed to the browser through a Web server when a Web site request fails. Error 404 appears by a page that does not exist or restricts access. This 404 error can be re-configured by the Webmaster to be more user-friendly.

[albertocosta]

The website hosting server will typically generate a "404 error" web page when a user attempts to follow a broken links hence the 404 error is one of the most recongnizable errors encountered on the World wide web.

[fitlion0]

The HTTP 404 Not Discovered Mistake signifies that the web site you were trying to achieve could not be on the server. It is a Client-side Mistake which signifies that either the page has been eliminated or shifted and the URL was not modified accordingly, or that you entered in the URL wrongly.

[Nirala]

404 error means the page you are requesting is not present on the server. It is often called a not found error.