A solenoid valve is an electromechanically operated valve designed to control the flow of liquids or gases. It uses an electric current to create a magnetic field, which moves a plunger to open or close the valve, regulating the flow through a pipe or system. Solenoid valves are widely used in various applications such as irrigation systems, heating and cooling systems, and automotive functions. They are valued for their precision, fast response times, and ability to automate fluid control processes efficiently.