Lol, there isn't exactlly a history of it, expect Kovu's first game was Impressive Title (IT) but now hes made a new one (take a wise guess!).
Groups are something you join in the game via invitation or sending an application in by the Prides/Pack/Clans section. They're for multiple reasons, Rp, general fun stuff... If you have any more troubles I suggest posting it int he Help section. :3
Welcome anywho! Enjoy your time here!