A timing chain is a crucial component in an internal combustion engine that synchronizes the rotation of the crankshaft and the camshaft. This synchronization ensures that the engine's valves open and close at the correct times during the combustion cycle, allowing for efficient engine performance. Unlike a timing belt, a timing chain is made of metal and is generally more durable, often lasting the lifetime of the engine. However, it can still wear out or stretch over time, leading to potential engine problems if not maintained properly. Regular inspections can help ensure the timing chain functions effectively.