Page-Rank is the measure of authority Google assigns to a web page


Page rank is the measure of authoritylink building
Google assigns to a web page, based
on an algorithm developed by Stanford
grad student and Google co-founder
Larry Page. Pages on the web are
crawled, and their contents are indexed
by a taxonomy of keywords. Some
pages are considered more relevant for
certain keywords than others, partially
based on word frequency, but chiefly
based on referring links from other
pages.more google Search Engine

A page with links from 100 pages would have a higher PageRank
than a page with links from only 10 pages—but only if all the
linking pages had equal PageRank. Some of those link pages will,
themselves, have more links than others; and some of the links to
the linking pages will also have their own backlinks.
Let’s take the page that only has links from 10 pages. If some
of those 10 pages have multiple links from still other pages,
the original page with “only” 10 links could be assigned more
PageRank than a page with 100 links from pages which have zero
links from other pages. Those 100 pages would be considered
less authoritative than a small group of pages that have actually
received links.

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