The starter motor is a crucial component of a car's ignition system, and its primary function is to initiate the engine's rotation during the starting process. When you turn the key in the ignition to start the car, the starter motor engages with the engine's flywheel, turning it over and initiating the combustion process. It plays a key role in the overall operation of a vehicle by ensuring reliable engine starts under various conditions. Regular maintenance and prompt addressing of any starter motor issues are essential to maintain the proper functioning of a vehicle's starting system.