A broken link or dead link is a link on a web page that no longer works because the website is encountering one or more of the reasons below. An improper URL entered for the link by the website owner. The destination website removed the linked web page (causing what is known as a 404 error)

The link which directs the users to the page which is unavailable or removed from the website is called broken links.

A broken link or dead link is a link on a web page that no longer works because the website is encountering one or more of the reasons below. An improper URL entered for the link by the website owner.

Broken links are links that lead to pages that do not exist. When clicking on a broken link, the page you land on is called a 404 error page, a standard HTTP response that indicates that the requested URL does’ not exist.
To find broken links Use W3c validator .

In a website content there are lots of keyword which has the anchor link for another website or web page. This anchor texts are working in redirecting to that specific page then it good but if its not redirecting to that page and showing errors like site unavailable the that anchor text link is called as broken link.