Google's Page Rank is a numeric value that represents
how important a page is on the web. Google figures that
when one page links to another page, it is effectively
casting a vote for the other page. The more votes that
are cast for a page, the more important the page must
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. How important each vote is taken into
account when a page's Page rank is calculated.
Page rank (Pr) is Google's way of calculating a web page's importance.
It is a factor that determines a
page's SERP. It is named after a Google founder, Larry Page and is not going away soon