Automotive relays are electrical switches that allow a low-current signal to control a high-current circuit. They are commonly used in vehicles to control various electrical components such as lights, horns, air conditioning, and fuel pumps. Relays provide a reliable way to control these components without the need for high-current switches or direct connections to the vehicle's electrical system. They are also designed to provide circuit protection by acting as a fuse, opening the circuit in the event of an overload or short circuit. When selecting an automotive relay, it is important to consider factors such as the type of load, voltage and current ratings, and the operating environment.