PageRank is a link analysis algorithm used by Google to measure the importance of web sites.Pagerank/ PR is developed by Larry Page. Google says “PageRank considers the importance of each page that casts a vote, as votes from some pages are considered to have greater value, thus giving the linked page greater value. We have always taken a pragmatic approach to help improve search quality and create useful products, and our technology uses the collective intelligence of the web to determine a page’s importance.”
Domain forging: When a website is permanently redirected (301 Redirect) to another site, Google considers these sites identical and it shows the same PageRank value for the site with redirection. This can be easily checked by googling info:domain.com
