Why are three terminals on a starter?

Three terminals on a starter typically include the battery terminal, the solenoid terminal, and the starter motor terminal. The battery terminal connects to the vehicle's battery, providing power to the starter. The solenoid terminal receives the signal from the ignition switch to engage the solenoid, which then connects the battery terminal to the starter motor terminal, allowing the motor to crank the engine. This configuration ensures efficient operation and control of the starting system.