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 each cylinder's intake and exhaust strokes, allowing for efficient engine performance. Unlike a timing belt, a timing chain is made of metal and is generally more durable and longer-lasting. However, it can still wear out over time and may require replacement. Regular maintenance can help ensure that the timing chain functions properly, contributing to the overall health of the engine.