A serpentine belt is a long, continuous belt used in vehicles to drive multiple peripheral devices from the engine's crankshaft. It typically powers components like the alternator, power steering pump, water pump, and air conditioning compressor. This design allows for a more efficient transfer of power and reduces the number of belts needed in the engine compartment. Serpentine belts are made from durable rubber and are designed to withstand high temperatures and friction. Regular inspection is important, as wear and tear can lead to belt failure, which may cause engine components to stop functioning properly. Replacing a worn serpentine belt is essential for maintaining vehicle performance.