vbulletin blog.. what's the difference
 

Okay, let me ask a question that might turn out to be stupid in the end... I already own an older version of vB. However, I am looking to resign and upgrade to a newer version as I am debating on whether or not to go to WordPress for blogging software, OR staying in the msg board forum format and staying with vB.

I am trying to find out... what the difference is between a blog site and a forum? And my next question is, what is the difference between the vBulletin forum software and a vB Blog? I mean, essentially, someone can just post their "blog" into a standard thread on the forum, what makes it so unique?