We install a Broken Link Checker plugin on all supported client sites. This plugin checks (but doesn't modify or update) existing links throughout your site, then generates a report listing any links with issues. It's good to review the Broken Link Checker reports regularly, since broken links in your web content can lead to problems with your SEO and search ranking.
We recommend you check out the videos and information from ShoutMeLoud to learn more about the Broken Link Checker plugin.