Hello,
I was wondering what was the difference between WP and BP. I read their doc but couldn’t figure out how exactly they differ, or can complete each other.
I’m interested in a multi-site project, which I can do with WP Network. Could BP be of any help?
Regards,
-jj. 
WordPress is CMS software.
BuddyPress adds social networking features to WordPress.
BuddyPress can be of help… if you want social networking features on your project.
WordPress is a CMS widely used for bloggin (But not limited to). BuddyPress is a component that you can add to WordPress and your WordPress Blog will turn to a membership site or ino ther words, a social network site.
WordPress is a blogging platform and content management system.
BuddyPress is a plugin for WordPress that turns it into more a multi-user social network platform (like Facebook, MySpace, etc).
With Buddypress you could turn Wordpress blog into:
Multi-author blog (each having individual blogs)
integrate forum
integrate social profile + friends/groups
shall create pages (like Fb)
Show trends (like Twitter)
Basically, Buddypress takes your Wordpress blog to next level…