Google Page Rank forum discussing tips and optimization techniques for both white hats and black hats to improve a site's PR. Talk about PageRank flux, sudden drops, and the biggest contributors to it.
PageRank is a sort of a voting system. A link for a page is vote for that entire webpage. First page are seem by Google as more important. Their votes are given meaning by Google.
it is the quality of inbound link where the strength of the web page lies, the better number of inbound link you will have the better your site will be placed on SERP.
I have read this all of the stuff and would like to say you that some engines simply count the number of links to a page, but as I have heard that Google has taken the idea a little more. Each inbound link is a page which itself has inbound links.