SEOmoz has a video up discussing PageRank, what it is and how it works.  PageRank is the number that Google assigns the pages on your web site.  Since Google doesn’t release definite information about PageRank and how it works, there are a lot of theories.  We know a majority of your PageRank scores comes from backlinks (links to your web pages).  There are tons of other factors that calculate your pagerank and hopefully this video will clear at least some things up.

SEOmoz Whiteboard Friday-What’s PageRank Got to do With It? from Scott Willoughby on Vimeo.