A solenoid valve is an electromechanical device used to control the flow of liquids or gases in a system. It consists of a coil of wire, known as a solenoid, that generates a magnetic field when electricity flows through it. This magnetic field moves a plunger or armature, opening or closing the valve to regulate the flow. These valves are commonly used in various applications, including irrigation systems, automotive engines, and industrial machinery. They offer quick response times and can be operated remotely, making them ideal for automated systems where precise control of fluid flow is essential.