Google pagerank update is the most time awaited by the bloggers around the world, pagerank is a patented algorithm that serves to determine which websites are more important / popular. Pagerank is one of the main features of the Google search engine.
A website will be popular if the many other sites that put links pointing to the site, assuming the site content is more useful than other sites.
Pagerank has the same basic concept of link popularity, but it does not only consider the "amount" of inbound and outbound links. The approach used is a page would be necessary if other pages have a link to that page. A page will also become increasingly important if other pages have high rankings refer to that page.