A starter motor is an electric motor that is used to start an internal combustion engine, such as those found in cars and trucks. When the ignition key is turned, the starter motor engages with the engine's flywheel, turning it to initiate the engine's operation. This process is essential for getting the vehicle running. The starter motor is powered by the vehicle's battery, which provides the necessary electrical energy. Once the engine starts, the starter motor disengages, allowing the engine to run independently. A malfunctioning starter motor can prevent the engine from starting, leading to potential vehicle issues.