What is page ranking ?

PageRank:

What is page ranking? It's defination is not really different to all but what is said by google?

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 analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important".

There are many defination of page ranking.In other words, a PageRank results from a "ballot" among all the other pages on the World Wide Web about how important a page is. A hyperlink to a page counts as a vote of support. The PageRank of a page is defined recursively and depends on the number and PageRank metric of all pages that link to it.Mainly incoming link. A page that is linked to by many pages with high PageRank receives a high rank itself. If there are no links to a web page there is no support for that page.

As google assigns a numeric weighting from 0-10 for each webpage on the Internet; this PageRank denotes a site’s importance in the eyes of Google. The scale for PageRank is logarithmic like the Richter Scale and roughly based upon quantity of inbound links as well as importance of the page providing the link.

There are numerous academic papers concerning PageRank have been published since Page and Brin's original paper.In practice, the PageRank concept has proven to be vulnerable to manipulation and extensive research has been devoted to identifying falsely inflated PageRank and ways to ignore links from documents with falsely inflated PageRank.So be aware about page ranking.Many people do not know about page ranking so they couldn't do so with their site.

How page rank calculated ?

Method to calculate Google PageRank:

While calculating Google PageRank for a web page, all of its inbound links are taken into account. These are links from within the site (Internal Links) and links from outside the site (External Links). PageRank can be calculated using a simple iterative algorithm. PageRank algorithm is in fact elegantly simple and is calculated as follows:
PR (A) = (1-d) + d (PR (T1)/C (T1) + ... + PR (Tn)/C (Tn))
wher;

• PR (A) is the PageRank of page A,
• PR (Ti) is the PageRank of pages Ti which link to page A,
• C (Ti) is the number of outbound links on page Ti and
• d is a damping factor which can be set between 0 and 1

Importance of Google PageRank:

PageRank helps Google's crawl to give preference to the web page, which has got good PR ranking. In fact, PageRank drives Google's monthly crawl, so that sites with higher PageRank get crawled earlier, faster, and deeper than sites with low PageRank. For a large site with an average-to-low PageRank, this is a major obstacle. If your pages don't get crawled, they won't get indexed. If they don't get indexed in Google, people won't know about them. In short, PageRank is the soul and essence of Google, on both the all-important crawl and the all-important rankings.