A drive belt is a continuous loop of rubber or other flexible material that transmits power from one rotating shaft to another. It is a common component in many mechanical systems, including engines, industrial machinery, and household appliances. The belt works by gripping the pulleys on each shaft, causing them to rotate in unison.

The primary function of a drive belt is to transmit mechanical power. It allows for the smooth transfer of torque and rotational speed between two or more shafts that may be located at a distance from each other. This enables the synchronization of various components within a system, such as the engine and alternator in a car.