A headlight switch is a control mechanism in a vehicle that allows the driver to turn the headlights on and off. It typically includes settings for low beams, high beams, and sometimes fog lights. The switch can be a lever on the steering column or a knob on the dashboard, depending on the vehicle's design. In addition to controlling the headlights, the headlight switch may also activate other lighting features, such as turn signals and parking lights. Proper use of the headlight switch is essential for safe driving, especially in low visibility conditions like nighttime or inclement weather.