This is the only chapter of the book that deals pretty much with theory only. However, because of the general confusion and hype over Google PageRank, it is important that you understand how PageRank works and what role it plays in achieving rankings.
PageRank, or PR, is a numeric value that Google places on how important a page is on the Web. PageRank is determined by how many incoming links there are for a page. Google figures that when one page links to another page, it is in effect “casting a vote” for the importance of the other page. The more incoming links (votes) there are for a page, the more important the page is to Google, generally speaking.
Many people have over-hyped PageRank and therefore introduced complexity that probably don't even exist, and added confusion that is not warranted. This may be partially because it is the only part of the Google ranking algorithm that is made public – well sort of.
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