I had the same question before but Drakan explained it for me. I guess it's an option for forums created for the sole purpose of playing games (RPG and the rest). Therefore if they had things like "clans" some people would be in the group A, which is created by clan A. We here don't do that, but to answer your other question, I have no idea how to start one
Also from what i read a while ago it can be used in the same way as the groups on places like Facebook for example. Like the example in the following link.
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