Force Choke

Chokeholding was an early level of the infamous Force Grip ability. Like Grip, it was used to telekinetically 'grip' one or more of the target's internal organs and apply pressure. However the target was not lifted or moved about. The area affected was typically the target's neck. It caused immobilization and choking, which with prolonged focus, could lead to death.

The reason why Sith masters usually used it instead of Grip, is when they need to just punish, threat or scare their target, without wanting to cause death.

Possibly the most notable display of this ability was by Darth Vader in the Death Star. Admiral Motti expressed his feelings concerning the Dark Lord's "sorcerer's ways", to which Vader replied with a Force Choke to his throat, saying "I find your lack of faith disturbing."

Information courtesy of Wookiepedia