What is Pagerank ?

PageRank is a patented algorithm that serves to determine which website is more important / popular. PageRank is one of the main features of the Google search engine and created by its founder, Larry Page and Sergey Brin who is a Ph.D. student Stanford University.

How it works

A site will be more popular if more and more other sites that put a link that leads to a site, assuming the content those sites more useful than the content of other sites. PageRank is calculated on a scale of 1-10.     Example: A site that has a Pagerank 9 will be the first listing in the Google search list instead of sites that have a Pagerank 8 and then onwards are smaller.


Many ways to use search engines in determining the quality / ranking of a web page, ranging from the use of META Tags, the contents of the document, the emphasis on content and many other techniques or combination of techniques that may be used. Link popularity, a technology developed to improve the shortcomings of other technologies (Meta Keywords, Meta Description), which can rigged with a special page designed for search engines or so-called doorway pages. With the algorithms 'PageRank'is, in every page will be inbound links (incoming links) and outbound links (links keuar) of each web page.

PageRank, has the same basic concept of link popularity, but not only take into account "the number of" inbound and outbound links. The approach used is a page will be considered important if other pages have a link to that page. A page will also become increasingly important if other pages rank (pagerank) high refers to the page.

Algorithm

From the approach already described in the article the concept of pagerank, Lawrence Page and Sergey Brin made pagerank algorithm as below:

Initial algorithm PR (A) = (1-d) + d ((PR (T1) / C (T1)) + ... + (PR (Mr.) / C (Mr)))

One of the other algorithms published PR (A) = (1-d) / N + d ((PR (T1) / C (T1)) + ... + (PR (Mr.) / C (Mr)))

    * PR (A) is the PageRank page A
    * PR (T1) is the PageRank of page T1 refers to page A
    * C (T1) is the number of outgoing links (outbound links) on page T1
    * d is a damping factor which can be between 0 and 1.
    * N is the total number of web pages (which is indexed by google)


From the above algorithm can be seen that the pagerank is determined for each of your pages is not the whole website. Pagerank pagerank of a page is determined from the page that refers to him who is also undergoing the process of determining pagerank in the same way, so this process will be repeated until the correct results were found. But the pagerank page A is not given directly to the intended page, but previously divided by the number of links on the page T1 (outbound links), and the pagerank will be divided equally to every link on that page. So it is with every other page "Mr." which refers to the "A ". After all pagerank gained from other pages that refer to the "A" are added, the value is then multiplied by the damping factor value between 0 and 1. This is done to avoid the overall value of T distributed pagerank page to page A.