Broken internal links are hyperlinks within a website that point to non-existent or inaccessible webpages, resulting in HTTP 404 error responses or broken links. Broken internal links can occur due to website restructuring, URL changes, content removal, or server errors. Search engines crawl and index internal links to discover and navigate website content, so broken internal links can hinder crawling and indexing of affected webpages. Webmasters should regularly audit internal links, fix broken links, and update URL references to maintain website integrity and search engine visibility. To address broken internal links, webmasters should use website crawlers or link checking tools to identify broken links, update or redirect broken links to relevant pages, and monitor crawl errors and index coverage in Google Search Console for indicators of broken link issues. They can also use redirects or custom error pages to gracefully handle broken link errors and provide alternative navigation paths for users and search engines.