Error 404

Meaning

An "Error 404" signifies that a requested webpage or resource cannot be located on the server, usually resulting in a "page not found" message.

Origin

The infamous "Error 404" is not, as popular myth suggests, tied to a specific room at CERN where files went missing; instead, it’s a foundational piece of the internet’s language: the Hypertext Transfer Protocol (HTTP). When your browser asks a web server for a page, the server replies with a three-digit status code. Codes beginning with "4" signal a client-side error, meaning the problem is with the request itself. The "404" specifically denotes that the server couldn't locate the file or resource you asked for. This systematic error code, formalized in the mid-1990s as the web began to boom, became the ubiquitous symbol for a digital dead end, silently telling us: "Page Not Found."

Examples

I tried to access the old company blog post, but all I got was an Error 404.
The website redesign caused an Error 404 on several of our internal links, which we need to fix urgently.