A starter motor is an electric motor used to start an internal combustion engine. It converts electrical energy from the vehicle's battery into mechanical energy, which turns the engine's flywheel. This process initiates the engine's operation, allowing it to run independently. Once the engine starts, the starter motor disengages to prevent damage. Typically, the starter motor is activated by turning the ignition key or pressing a start button. It is an essential component in vehicles, including cars and trucks, ensuring reliable engine starting under various conditions.