The internal link checker tool can be used to check the link structure of a specific page. It shows the total number of links on a page. This amount is split into internal and external links. Internal links are links that point to pages within the website, while external links are links to other websites. The internal links are split into absolute URLs (the full URL including the domain name) and relative URL’s (only the path excluding the domain name). This tool can be used to optimize the internal link structure for SEO.