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A starter relay is an electrical component found in vehicles that helps to transmit power from the battery to the starter motor, allowing the engine to start. It serves as a switch that controls the flow of electricity to the starter, ensuring that the motor receives the necessary power to crank the engine. The relay is typically activated by turning the ignition key, which triggers a low current signal to the relay, causing it to close the circuit and send a larger current to the starter motor. This helps to protect the ignition switch and other components from the high current required to start the engine.