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". ”
To begin with you must remember that in case there are no links to a web page then there is no support for that page. But then why do you need the support? Well you need the support because a page receives a high rank if it is linked to by many pages. A PageRank is a consequence of a "ballot" among all the other pages on the World Wide Web about the importance of a page. In this regard a vote of support is nothing but a hyperlink to a page. The PageRank of a page relies on the number and PageRank metric of all pages that link to it ("incoming links").
Google judges the importance of a site and allots a numeric weighing from 0-10 for a webpage on the Internet and this is PageRank. The PageRank results from a theoretical probability value on a logarithmic scale like the Richter Scale. The PageRank of a page is not only based on the amount of inbound links but also on the PageRank of the pages giving the links. Other factors also influence the PageRank e.g. significance of search words on the page and tangible visits to the page reported by the Google toolbar. In order to prevent exploitation, spoofing and Spamdexing, Google gives no precise details about how other factors maneuver PageRank.
PageRank Technology: PageRank mirrors our view of the significance of web pages by taking into account more than 500 million variables and 2 billion terms. Pages that we deem as important pages get a higher PageRank and are more liable to come out at the top of the search results.
The magnitude of each page that casts a vote is also considered by PageRank, as votes from some pages are considered to have bigger value, and in the process the linked page gets greater value. Ours is a sensible approach to help improve search value and fashion handy products, and our technology makes use of the combined intelligence of the web to establish a page's importance.
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