Engine valves are crucial components in an internal combustion engine. They control the flow of air and fuel into the combustion chamber and the exhaust gases out of it. Typically, there are two types of valves: intake valves, which allow the air-fuel mixture to enter, and exhaust valves, which let the burnt gases exit. These valves open and close at precise times during the engine's cycle, coordinated by the camshaft. Proper functioning of engine valves is essential for optimal engine performance, fuel efficiency, and emissions control. Regular maintenance can help ensure they operate effectively throughout the engine's lifespan.