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Google Page Rank is way over-valued by many webmasters. It is not
unusual for a website with a Page Rank of 2 to outrank a website with a
Page Rank of 5. The reason is that Page Rank is only an indicator of one
of many factors, and Page Rank is not even a reliable indicator, at that. Google Page
Rank is simply a measurement of how many pages link to you. Every page
that links to your site gives your site a certain number of points. The
number of points the link gives your site is determined by dividing the
number of points that that page has by the number of links it has to
other websites. Google Page Rank (PR) is becoming increasingly
unreliable. In the most recent update, millions of web pages were
changed to a Page Rank of 0, for no apparent reason. Page Rank
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".
In other words, a Page Rank 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 Page Rank of a page
is defined recursively and depends on the number and Page Rank metric of all pages that link to it ("incoming links").
A page that is linked to by many pages with high Page Rank receives a
high rank itself. If there are no links to a web page there is no
support for that page.
In practice, the Page Rank concept has proven to be vulnerable to
manipulation, and extensive research has been devoted to identifying
falsely inflated Page Rank and ways to ignore links from documents with
falsely inflated Page Rank.
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