PR 4/5/6/7 etc ??

[webneb]

What is the pr system all about. I've seen people advertise for PR4 and above etc. I think PR stands for pagerank but what is the pagerank system. Is
it to do with search engine results or positioning?
Thanks for any info.

 

[NameTower]

google's pagerank.

http://www.google.com/technology/

see your pagerank using the google toolbar:
http://toolbar.google.com