A clutch disc is a crucial component in a vehicle's transmission system. It is located between the engine's flywheel and the pressure plate. The primary function of the clutch disc is to engage and disengage the engine's power from the transmission, allowing the driver to change gears smoothly. When the driver presses the clutch pedal, the pressure plate releases the clutch disc from the flywheel, interrupting the power flow. This action enables gear shifts without damaging the transmission. Once the pedal is released, the clutch disc re-engages, allowing the engine's power to transfer back to the wheels, propelling the vehicle forward.