What is the purpose of the clutch in a manual transmission vehicle?

The clutch connects and disconnects the engine from the transmission. Pressing the clutch pedal disengages the engine from the drivetrain, allowing the driver to change gears or come to a stop without stalling; releasing it re-engages the engine to the transmission to transfer power. The clutch works by pressing a friction disc against the engine's flywheel. Automatic transmissions use a torque converter instead of a driver-operated clutch. Understanding the clutch's role in smoothly connecting and disconnecting engine power is core drivetrain knowledge for manual vehicles.