Google's PageRank

PageRank plays an important roles in Google's search. It is a numeric value that represents how important a page on the web. This can determine by the number of other pages that link to the main page. Google has figures that when one page links to another page in the web, it will casting a vote for that particular page. Page that has more vote, the more important the page in the web.

PageRank have been use by Google to determine a page's relevance or importance. Google calculates a page's importance from the vote cast for it. How important each vote is taken into account when page's PageRank is calculated.

In short PageRank is all about "vote" by other pages on the web and the importance of the page that reside in the web. A link to a page counts as a vote of support and if there is no link to the page that mean it got no support.

Further reading : Google Technology