An air horn is a device that produces a loud sound by releasing compressed air. It typically consists of a metal or plastic canister filled with air and a nozzle that directs the sound. When the nozzle is pressed, the air escapes rapidly, creating a sharp, attention-grabbing noise. Air horns are commonly used in sports events, celebrations, and as signaling devices. These horns are often found in boating and emergency situations to alert others or signal distress. They are portable and easy to use, making them popular for various outdoor activities. However, their loudness can be disruptive, so they should be used responsibly.