Google
PageRank
These eight pages might be useful for
webmasters to read before they decide to offer an opinion,
or post a comment on a Forum about Google
PR.
Within the past few years, Google has become
the far most utilized search engine worldwide. The main reason,
besides high performance and ease of use, was the superior
quality of search results compared to other search engines. One
of over 100 factors involved in the Google algorithm is
PageRank, a sophisticated method to rank web
pages. A note direct
from Google on the subject of PageRank
Google
PageRank
The aim of these pages is to provide a
summary of some aspects of Rank. The ideas expressed are based
on papers by Google founders Lawrence and Sergey Brin while at
Stanford University.
It is sometimes stated that too
much time has passed since the scientific work on PageRank, for
it still to be the basis for the ranking methods of the Google
search engine. Despite the many changes, adjustments and
modifications since those early days, and as many as ten per
month currently, the fundamental concept behind PageRank
remains perfectly valid.
The Google PageRank
Concept
Since the early stages of the world wide web,
search engines have developed different methods to rank web
pages. Initially, the frequency of a search phrase within a
page was the major factor within ranking techniques of search
engines. The frequency of a search phrase can be ranked as
keyword density, or by its accentuation within a page by HTML
tags. The advent of the current Google search technology has
made that redundant. In view of the market domination by
Google, there are webmasters who no longer even use META
keyword tags, and are nevertheless No.1 in Google.
For the purpose of better search
results and especially to make search engines resistant against
automatically generated web pages, the concept of link
popularity was developed. Following this concept, the number of
inbound links for a page measures its general importance.
Hence, a web page is generally more important, if many other
web pages link to it, in other words, vote for that
page.
Google PageRank and Relevant
Links
Contrary to the concept of link popularity,
PageRank is not simply based upon the total number of inbound
links. The basic approach of PageRank is that a page is in fact
considered the more important the more other pages link to it,
but those inbound links do not count equally. The basic
principle is that a page receives credit from a link from
another high ranking page. But that is not the whole story. If
the page from which the link arises has no connection with the
theme of the page to which the link points, any credit is
doubtful.
So, within the PageRank concept,
the rank of a page is given by the rank of those pages which
link to it. Their rank again is given by the rank of pages
which link to them. Hence, the PageRank of a page is always
determined recursively by the Rank of other pages. Since the
rank of any page influences the rank of any other, PageRank is
based on the linking structure of the whole web. Although this
approach seems to be very broad and complex, Page and Brin were
able to put it into practice with their
algorithm.
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