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Switches in the context of automotive and automotive restoration, specifically ignition systems, refer to manual control devices that open or close an electrical circuit. They serve as the point of connection between a power source and an electrical component, enabling or disabling its operation based on user input. Switches can vary in complexity from simple toggle switches to more sophisticated keyed ignition switches, each designed to provide reliable and safe control over various automotive systems. Their role is crucial in ensuring proper functionality of ignition systems, as they serve as the gatekeepers of electrical current flow, allowing for precise control over engine starting, running, and accessory operations.