An automotive relay is an electrically operated switch designed to control the flow of electricity within a vehicle's electrical systems. In essence, a relay acts as a middleman between low-power and high-power circuits. It is typically composed of an electromagnet, a set of contacts, and a spring mechanism. When a low current is supplied to the electromagnet, it creates a magnetic field that attracts a set of contacts. These contacts then close or open the circuit, allowing or interrupting the flow of electricity to power other components.

    In automobiles, relays perform a wide variety of functions, such as managing lighting, air conditioning, engine systems, and more. They enable drivers and vehicle systems to control multiple circuits with minimal effort, ensuring seamless operation of the car.