A pushrod is a mechanical component used in internal combustion engines to transfer motion from the camshaft to the engine's valves. It plays a crucial role in the engine's operation by opening and closing the valves at the right time, allowing air and fuel to enter the combustion chamber and exhaust gases to exit. Typically made of metal, pushrods are found in V8 engines and other configurations where overhead valves are used. They are part of a larger system that includes the camshaft, valves, and rocker arms, all working together to ensure efficient engine performance.