Link rot (or linkrot), also known as link death or link breaking, is the internet slang for the condition where hypertext links lead nowhere because Web sites have removed Web pages or reorganized them. Also known as outdated links.
It is an informal term for the process by which hyperlinks (either on individual websites or the Internet in general) point to web pages, servers or other resources that have become permanently unavailable. The phrase also describes the effects of failing to update out-of-date web pages that cluttersearch engine results.
A link that does not work any more is called a broken link, dead link, or dangling link.
Formally, this is a form of dangling reference : the target of the reference no longer exists.