Page rank is a measure of popularity of a page used by Google. Ranging from 0 to 10.
Each page on a web site has it’s own rank.
Page rank is calculated based on the amount of links coming into a page of different page ranks. Each page votes for another page by linking to it.
Google is now though to keep different page ranks based on topic area rather than just the one you can find out.
Page rank can be seen on the google tool bar or various page rank checking sites.
The Page rank that is shown is updated infrequently.
While important in indicating the weight of a page it is not something to be obsessed by.
Popularity: 30% [?]