Doubles, Triples and Quads

Hi
Have never played in any of these types of games and was wondering how they work.
Do you play as a team, but can you also attack members of your team?
Is the "chat" private between members of your team?
If a normal standard game then how is the game won. Is it the killing of all members of the opposing team?
Any and all help is greatly appreciated.
Have never played in any of these types of games and was wondering how they work.
Do you play as a team, but can you also attack members of your team?
Is the "chat" private between members of your team?
If a normal standard game then how is the game won. Is it the killing of all members of the opposing team?
Any and all help is greatly appreciated.