Google Page Rank is a value that indicates the importance of a web page on the internet. Google figures that when one page links to another page, it is effectively casting a vote for the other page - this is how they calcuate the Page Rank. The more links (and therefore votes) that are pointing to a page, the more important that page is. Also, the importance of the page that is casting the vote determines how important the vote itself is. Google calculates a page's importance from the votes cast for it and then gives it a Page Rank. How important each vote is is taken into account when a page's Page Rank is calculated.

Ian Dodson