PageRank was designed around links between web pages. In simple terms, links can help search engines understand relationships, authority, and the importance of different pages. Google’s modern ranking systems use many signals rather than relying on one publicly visible number.
This means that when you check Google PageRank you should not expect to find an official Google score displayed for your website. Third-party SEO tools may provide their own authority or link-based metrics, but these should not be confused with Google’s private PageRank calculation.