For those of you who dont know what TeamSpeak is or does. Its a voice chat program/server where you can meet up with your fellow gamers and talk in realtime while you play.

Example: M. Bison and MarineKing join the teamspeak server and then meet up in the Starcraft channel. They then enter Starcraft and start a game together and instead of chatting in game chat they use their microphones and tell each other what you build/attack/defend etc.

Hope this clears it up for ya!