What is a broken link?

Hi guys.Can anyone help me to know about broken link.

Broken links are web links or URLs in your website that are unreachable. In simple terms broken links are URLs in your website that are not functioning or opening. Broken links are considered to be of negative value as far as SEO perspective of a website is concerned.

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).

A broken link is a hyperlinks a website which is linked to an empty or non-existent external webpages.