A torque converter is a key part of your car’s automatic transmission. They’re one of the main things that distinguishes automatic from manual transmissions. Here’s a brief summary of how they work.
A drive shaft is a device that transmits rotation from the engine to the wheels of a vehicle. These are typically found in rear wheel drive vehicles whose engines are mounted in the front. In such vehicles, a drive shaft connects the transmission to the axles of the rear wheels. Here’s an article about the role they play in the drive train.