A vehicle horn is like a loud speaker on a car or a bicycle that makes a sound to let people know that the driver wants to alert them. The horn makes a loud and clear noise that can be heard from far away. When the driver presses the horn button, air is forced through a small gap in the horn, which creates a sound wave that can be heard.
It's important to use the horn only when it's necessary, like when there's danger or somebody needs to move out of the way. It's not for playing around or showing off. Some vehicles have different horn sounds, like a police car or an ambulance. These sounds can be different so that people can quickly recognize them and know what to do.
In summary, the vehicle horn is a loudspeaker that makes a loud sound when the driver wants to alert other people on the road. It's only supposed to be used in specific situations and is important for keeping everyone safe while driving.