A broken link (also known as a dead link) is a link within a target website that points to a web page that has become permanently unavailable.
In Ahrefs Site Explorer, we have a 'Broken links' report which shows all the outbound broken links together with their anchor texts that were found within a target website.
Note that a broken link can be both internal (pointing to another page of the same domain) or external (pointing to a web page within the other domain).
A link can become broken for a variety of reasons such as the page has been moved, the domain expired, etc. That’s why in the 'Broken links' report, each link is marked with a red tag that specifies the issue — for instance, '404 not found' or 'cannot resolve host'.
It’s recommended to fix broken links of your own website for better user experience. You can find more details about how to check your website for broken links here.