ELI5: Explain Like I'm 5

Torque converter

A torque converter is like a special type of gear in a car that lets the engine turn your wheels. It helps the car to go faster or slower. When you press the gas pedal, the torque converter helps the engine to give extra power to the wheels, so it can go faster. When you stop pressing the gas, the torque converter helps the engine to slow down the car.