Definition
Internal linking — Internal links connect pages of the same site; they aid discovery, pass signals and explain relationships between topics.
Quick answer
Important pages should sit within 3 clicks of the home page and receive links with descriptive anchors from relevant content. Avoid orphan pages.
Principles
- links from content, not only from the menu;
- descriptive anchors (“technical SEO audit”, not “here”);
- links between related topics — e.g. article ↔ Wiki term ↔ service.
Sources
- Google Search Central documentation — Google