A car horn is a sound-emitting device found in vehicles, designed to alert others of the car's presence or to signal warnings. It typically produces a loud, distinctive noise when activated by pressing a button on the steering wheel. Car horns are essential for safety, helping to prevent accidents by notifying pedestrians and other drivers. Most car horns operate using an electric system, which powers a diaphragm that vibrates to create sound. The volume and tone can vary between different vehicles, but they all serve the same primary purpose: enhancing communication on the road. Proper use of a car horn is important to avoid unnecessary noise pollution.