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Google PageRank (PR) Explained
PageRank is a method
invented by Google to measure
the relative importance of web pages, which is often called
popularity. Google provides
a list of points that
webmasters need to follow to gain high page rankings.
- Page Rank is based on the topology of a web
site, i.e. the links structure between pages. It compiles
a precise analysis of the contents of the indexed pages (keywords,
occurrences, positions in the document, type of HTML tag, etc.)
- A classification of the pages according to
their popularity (PageRank), is calculated from the topology
of the Web (i.e. the whole structure of the documents and the
links between them).
- PageRank isn't linear, it's logarithmic, making
it a lot harder to boost a page's PR from 5 to 6 than from
4 to 5. The PR shown in the Google toolbar isn't the actual
PR of the page, just the integer value.
- If your site is in a competitive field, a 5
might be an excellent PR. If it is listed in a non-competitive
field you need to aim for a higher PR. In general though, when
it comes to PR higher is always better.
- PageRank plays a role in how highly a page
is ranked in the Google search results for a given search term.
Everything else being equal, the page with the highest PR will
be ranked highest.
Google Page Rank Algorithm
Google uses a complex PageRank
algorithm to calculate each page's PR based solely on
the quantity and quality of inbound links to the page.
- The main
idea is that if a page A has
a link to a page B, then the
page A "thinks" that
page B is important enough to deserve being cited and
maybe visited by visitors of page A. This link from A
to B increase the PageRank of B.
- The higher the PageRank of page A, the higher
the increase of the PageRank of page B. In other words,
it is more expedient to get a link from the homepage of Google
than one from a page of an unknown site.
- The less page A has out-links, the more page
B's PageRank increases. In other terms, if page A "thinks" that
there is only one page deserving a link, then it is quite
natural that the PageRank of this page B increases more
than in the case where lots of pages get a link from page
A.
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