A pulley belt is a flexible loop used to transmit mechanical power between two or more rotating pulleys. Common types include V-belts, serpentine belts, and timing belts. Manufactured from rubber compounded with reinforcing cords, it offers high tensile strength and wear resistance. Applications include automotive engines, industrial conveyors, and HVAC fans. The belt's friction grip or positive tooth engagement ensures efficient torque transfer, absorbs vibration, and accommodates misalignment. Regular tension inspection prevents slippage and extends service life in power transmission systems.