A broken link is a web-page that can’t be found or accessed by a user,
for various reasons. Web servers will often return an error message whena user tries to access a broken link. Broken links are also often
known as “dead links” or “link rots.”
Examples of a broken link error code:
404 Page Not Found: the page/resource doesn’t exist on the server
400 Bad Request: the host server cannot understand the URL on your page
Bad host: Invalid hostname: the server with that name doesn’t exist or is unreachable
Bad URL: Malformed URL
Bad Code: Invalid HTTP response code: the server response violates HTTP spec
Timeout: Timeout: HTTP requests constantly timed out during the link check
Reasons:
The website owner entered the incorrect URL (misspelled, mistyped, etc.).
The URL structure of your site recently changed (permalinks) without a redirect and it’s
causing a 404 error.
The external site is no longer available, is offline, or has been permanently moved.
Links to content (PDF, Google Doc, video, etc.) that has been moved or deleted.
I'll provide you:-
Check your broken backlinks.
High authority check.
Fix the error.
Delete your 404 error page.
Suggestions.
Revision.
THANK YOU