Tire valves are small devices attached to the wheels of vehicles that allow for the inflation and deflation of tires. They are essential for maintaining proper tire pressure, which is crucial for vehicle safety, fuel efficiency, and tire longevity. The most common type is the Schrader valve, found in most cars, while Presta valves are typically used in bicycles. These valves consist of a stem and a core that opens and closes to let air in or out. Regularly checking and maintaining tire valves can prevent air leaks and ensure that tires remain properly inflated, contributing to overall vehicle performance and safety.