By MikeCP on September 29, 2010
By randfish on September 6, 2010
By richardbaxterseo on June 14, 2010
By Matt Cutts on June 16, 2009
People think about PageRank in lots of different ways. People have compared PageRank to a “random surfer” model in which PageRank is the probability that a random surfer clicking on links lands on a page. Other people think of the web as an link matrix in which the value at position (i,j) indicates the presence of links from page i to page j. In that case, PageRank corresponds to the principal eigenvector of that normalized link matrix.