PageRank (PR) is a Google tool that expands on the easier link popularity calculation.

* The Gray Bar in the PageRank tool indicates that a web page has not been added to the Google PageRank file, or Google has banned the website.

* PR0 to PR10. PR0 indicates that the web page has been added to the Google database, but it does not yet have any PageRank assigned to it, usually because there are not any PR value pages that link to it at this time.

If one is tracking PageRank from the Google toolbar, then it needs to be understood that the database that stores PageRank values is only updated about once every 3-4 months.

While Google does use links to a web page to determine the web page's PR value, it is impossible these days to make use of Google to find what links are directed to your pages. Even the Google webmaster tools interface will not explain you all of the links Google is counting towards your own Link Popularity or PR value.

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