What does a solenoid switch do?

A solenoid switch is an electromechanical device that uses an electromagnetic coil to actuate a switch or relay. When electrical current flows through the coil, it generates a magnetic field that moves a plunger or armature, closing or opening the electrical circuit it controls. This mechanism is commonly used in automotive starters to engage the starter motor and in other applications where remote switching of high-current loads is needed. Essentially, it allows a low-power signal to control a high-power circuit safely and efficiently.