Monday, August 16, 2010

Google PageRank formula

What is all this fuss about PageRank?

Google's founders, Sergey Brin and Larry Page created their search engine algorithm that shifted the ranking weight to off-page factors. The formula called PageRank (named after its founder Larry Page) evolved where the algorithm would score out of ten the "value" of each website in comparison to other websites on the Internet. It is based on two key factors; the number of links you have pointing to your website and the value of the links pointing to your website. The value is calculated based on the PageRank of the page linking to your website and the relevancy of the page linking to your site.

In order to do this, you should begin by understanding Google’s PageRank. Although Google PageRank is the heart of the Google algorithm, it is not the absolute consideration in determining the most relevant website and hence the highest listing in the search engine results pages. A definition of PageRank as provided by Google is included below:

Defining Google PageRank

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyses the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important." Importantly, high quality sites receive a higher PageRank, which Google remembers each time it conducts a search. Of course, important pages mean nothing to you if they don't match your query.

So, Google combines PageRank with sophisticated text matching algorithms to find pages that are both important and relevant to your search. Google goes far beyond the number of times a term appears on a page and examines all aspects of the page's content (and the content of the pages linking to it) to determine if it's a good match for your query.

PageRank of the Linking Page

Firstly, PageRank of the linking page is one of the most important factors as it determines how much value of importance is passed on to your web page. The higher the PageRank of the linking page, the higher the value your website will receive.