Broken links are the outer site to which your site is connected yet presently no more exist.
So presently assuming anybody visits your webpage rather than that connected page site show a 404 not found mistake which is essential for terrible Web optimization practice.
Using a Broken Link Checker, you must be aware of which links have a Status of 200, 301, or 404 in order to remove such a link from your site.
You must either remove that link or link to other content for those with a 404 status. So it will make your occupation simpler to fix the Web optimization issues.
