A Schrader valve is a type of valve commonly used in various applications, including car tires and bicycle tires. It allows for easy inflation and deflation of air. The valve consists of a cylindrical body with a spring-loaded pin that opens when pressed, enabling air to flow in or out. These valves are typically made of metal and rubber, ensuring durability and a tight seal. They are standardized, meaning they can be found on many vehicles and equipment, making them a convenient choice for maintaining proper air pressure in tires and other inflatable items.