A torque converter is a type of fluid coupling used in automatic transmissions to transfer power from the engine to the wheels. It allows the engine to keep running while the vehicle is stationary, enabling smooth acceleration without stalling. The converter uses hydraulic fluid to transmit torque, which helps to multiply the engine's power during acceleration. Inside a torque converter, there are three main components: the impeller, the turbine, and the stator. The impeller is connected to the engine and spins with it, creating fluid movement. The turbine, connected to the transmission, receives this fluid and turns, while the stator redirects the fluid back to the impeller, enhancing efficiency.