Exhaust valves are crucial components in an internal combustion engine. They open to allow exhaust gases to exit the combustion chamber after fuel has been burned. This process helps maintain engine efficiency and performance by ensuring that fresh air and fuel can enter the chamber for the next cycle. These valves are typically made of durable materials to withstand high temperatures and pressures. They work in conjunction with intake valves, which control the entry of air and fuel into the engine. Proper functioning of exhaust valves is essential for reducing emissions and optimizing engine power.