A Schrader valve is a type of valve commonly used in automotive 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 also found in other applications, such as refrigeration systems and air conditioning units. They are named after Johann Schrader, who patented the design in the 1890s. The simplicity and reliability of the Schrader valve make it a popular choice for various inflation needs.