Electromagnetic valves, also known as solenoid valves, are devices that control the flow of liquids or gases in a system. They use an electromagnetic coil to open or close the valve, allowing or stopping the passage of the fluid. When electricity flows through the coil, it generates a magnetic field that moves a plunger, changing the valve's position. These valves are widely used in various applications, including automated irrigation systems, industrial machinery, and HVAC systems. Their ability to operate quickly and efficiently makes them essential for controlling fluid dynamics in many modern technologies.