If VB is like PhpBB, them the admins can create groups with different properties like permissions or other things. If its a public group anybody can choose to be in that group, for instance you could have a ZT group and a 75 group, and by being in one of those groups the forum would apply the group properties so the ZT group might have ZT avatars and the 75 group have 75 avatars. Thats just an example of the way I see groups... I don't think this site has any public groups, but for instance there are predetermined groups ie subscribers & non subscribers, mods & admins etc.
Awaits a mod or admin to clarify
