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. Timing chains are typically made of metal and are designed to last longer than timing belts, which are made of rubber. Unlike timing belts, which require regular replacement, timing chains are generally more durable and can last the lifetime of the engine. However, they can still wear out or stretch over time, leading to potential engine problems. Regular maintenance and inspections can help ensure the timing chain functions properly, preventing costly repairs to the engine.