< CFcoffee />

PageRank (PR) is Google's way to measure the importance of a page. This system for weighting importance helps Google search engines to identify sites which clearly show relevance to its contents.

PageRank is measured on a scale of one to ten; ten being the highest a site can be awarded (although only a hand full of sites have a ten).

To obtain PR your sites have to have casting votes, worked out on this simple formula, (simple, well not for me)

Quoting from the original Google paper, PageRank is defined like this: We assume page A has pages T1...Tn which point to it (i.e., are citations).

The parameter d is a damping factor which can be set between 0 and 1. We usually set d to 0.85. There are more details about d in the next section. Also C(A) is defined as the number of links going out of page A. The PageRank of a page A is given as follows:

PR(A) = (1-d) + d (PR(T1)/C(T1) + ... + PR(Tn)/C(Tn))