According to Google: “PageRank is the measure of the importance of a page based on the incoming links from other pages. In simple terms, each link to a page on your site from another site adds to your site’s PageRank. Not all links are equal.” The algorithm was named after Google co-founder Larry Page.
Recommended reading:
- The PageRank Citation Ranking: Bringing Order to the Web by Larry Page
- The Anatomy of a Search Engine by Sergey Brin and Larry Page