What it means
Internal links guide readers to related content and show search engines how your pages connect. They’re the most direct way to signal where a topic lives on your site.
Pages with no internal links pointing to them (orphan pages) are harder to find, for readers and search engines alike.
How to use it
Adding internal links takes less effort than creating new content or doing a major refresh. Check regularly that the pages in each topic cluster link to each other and to their pillar page.