404 code (also known as the "page not found" code) is a standard server http response when it has been asked for a resource (such as a page or image) that it can't locate. It means that the page you've requested is not there. Used as a verb (such as in the sentence "I 404'd the page.") it means you had a page, but took it off the server so that anyone looking for it now only receives a 404 code that the page doesn't exist. Your request isn't being routed to a replacement page using a 301 or 302 code. It means the page you wanted ceased to exist, or never existed in the first place.
Celebrating 25 Years of Creating an Island of Stability In the Sea of Online Confusion
