Final answer:
The main purpose of the starter system in a vehicle is to start the engine. It consists of a starter motor that requires a large current from the battery. Once the engine starts, the alternator supplies power to run the vehicle.
Step-by-step explanation:
The main purpose of the starter system in a vehicle is to start the engine. The starter system consists of a starter motor that requires a large current to be supplied by the battery. Once the engine starts, the alternator takes over supplying electric power to run the vehicle and charge the battery.