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What is Page Rank (PR) ? - a common theories roundup

WebmasterWorld has a nice round-up on PageRank - aimed at web marketeers at beginner's level ...

covering:

Google's take on PR

Quote:

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important.

  • How can I check my PR?
  • How does page rank affect your listing in SERPs (Search Engine Result Pages)?
  • What detrimental effects will I face for buying PR?
  • I'd still like to improve the Page Rank of my site?
  • What links do I need to get to take my homepage to PR6
  • I've added a lot of IBLs but I don't see my PR changing/my PR has dropped
  • How often does the PR change?
  • Will they inform me when they revise PR?
  • Help, I've lost all PR!
  • Why is my PR more in the Google directory than it is on the toolbar?
  • It was easy to get from a PR4 to a PR5 but it's taking much longer to get to a PR6, why's that?
  • How can I retain PR on my site and prevent it from going to other sites?
  • If PR is virtually useless from the point of view of Google traffic then why did you ramble on for so long and cover all those point?
  • So if PR doesn't determine how I rank then what does?

Of course many of the concepts and ideas follow the common believes in Page Rank ... when reading such round-ups always keep in mind that it's unofficial information and observations - and not confirmed by Google... altough pretty common understanding, I am sure there are some mis-perceptions or some crucial details missing (as with all theories)

Google PR Basics