At the end of a game, the players of one team win, and the players of the other one lose all together.
Players on the same team can ‘pass through’ each other: rabbits will no longer bump into each other. That’s why teams are often useful in custom game types like test: each player joins the game as blue, which allow everyone to move without annoying anyone else.
Team mates cannot hurt each other either, but a well-aimed RF missile can still force a team mate to blink, even though he does not receive any damage.
Custom game types based on teams derive from CTF.
Eat your lima beans, Johnny.