Page Rank is the numeric value assigns by Google to the websites. The greater the value of PR, the higher the importance of the site. The value runs from 0 to 100. Google algorithm is a PR is the combination is a natural way. Today link exchanges and link building has become a rich market for their right to undermine the essence of the original Page Rank. It is the best way to compete is to join the race and make serious efforts to build links.