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 heat-resistant materials to withstand high temperatures. They are operated by the engine's camshaft, which controls the timing of their opening and closing. Proper functioning of exhaust valves is essential for reducing emissions and improving overall engine health.