What is Page Rank ?
Briefly Page Rank could be a “vote”, by all the other pages on the Web, concerning how necessary a page is. A link to a page counts as a vote of support. If there is no link there’s no support (but it’s an abstention from voting rather than a vote against the page).
How is Page Rank Used?
Page Rank is one in every of the strategies Google uses to work out a page’s relevance or importance. It’s solely one part of the story when it comes to the Google listing, but the opposite aspects are mentioned elsewhere (and are ever changing) and Page Rank is fascinating enough to deserve a paper of its own.
Page Rank is additionally displayed on the toolbar of your browser if you’ve put in the Google toolbar (http://toolbar.google.com/). But the Toolbar Page Rank solely goes from zero – 10 and seems to be one thing sort of a logarithmic scale:
Toolbar Page Rank:
(log base 10) Real Page Rank
0 0 – 10
one 100 – 1,000
2 1,000 – 10,000
three 10,000 – one hundred,000
4 and therefore on…
We have a tendency to cannot know the exact details of the size because, as we tend to’ll see later, the utmost PR of all pages on the net changes every month when Google does its re-indexing! If we have a tendency to presume the dimensions is logarithmic (although there is solely anecdotal evidence for this at the time of writing) then Google could merely give the very best actual PR page a toolbar PR of 10 and scale the remainder appropriately.
Conjointly the toolbar sometimes guesses! The toolbar typically confirmed a Toolbar PR for pages I’ve solely simply uploaded and cannot probably be within the index yet!
What looks to be happening is {that the} toolbar appearance at the URL of the page the browser is displaying and strips off everything down the last “/” (i.e. it goes to the “parent” page in URL terms). If Google incorporates a Toolbar PR for that parent then it subtracts one and shows that as the Toolbar PR for this page. If there’s no PR for the parent it goes to the parent’s page, but subtracting a pair of, and thus on all the method up to the basis of your site. If it cannot realize a Toolbar PR to display in this approach, that is if it doesn’t realize a page with a real calculated PR, then the bar is greyed out.
Note that if the Toolbar is guessing during this way, the Actual PR of the page is 0 – though its PR will be calculated shortly after the Google spider initial sees it.
PageRank says nothing about the content or size of a page, the language it’s written in, or the text used in the anchor of a link!
Definitions
I’ve started to use some technical terms and shorthand in this paper. Now’s as sensible a time as any to define all the terms I am going to use:
PR: Shorthand for PageRank: the actual, real, page rank for every page as calculated by Google. As we tend to’ll see later this can range from 0.fifteen to billions.
Toolbar PR: The PageRank displayed in the Google toolbar in your browser. This ranges from zero to 10.
Backlink: If page A links out to page B, then page B is claimed to have a “backlink” from page A.
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