A car horn is a device found in vehicles that produces a loud sound to alert others on the road. It is usually activated by pressing a button on the steering wheel. The sound can warn pedestrians, cyclists, or other drivers of a vehicle's presence, helping to prevent accidents and ensure safety. In addition to safety, a car horn can also express frustration or communicate with other drivers. For example, a quick honk might signal a friendly greeting, while a longer blast could indicate impatience in traffic. Overall, the car horn plays an important role in road communication and safety.