A megaphone, also known as a bullhorn or loudhailer, is a powerful acoustic device used to amplify and project sound over a long distance. It consists of a cone-shaped or horn-shaped device with a handle and a built-in microphone. By speaking into the microphone, the user's voice is amplified and directed through the megaphone, resulting in a louder and more easily audible sound.

Megaphones have a wide range of applications and are commonly used in various settings. They are frequently employed by crowd control personnel, event organizers, sports coaches, and emergency responders to communicate instructions, announcements, or warnings to large groups of people. Their high volume and projection capabilities make them indispensable in situations where verbal communication needs to reach a broader audience.

In addition to their sound amplification function, modern megaphones may also include additional features such as built-in sirens, volume control, and the ability to connect external devices like smartphones or MP3 players for playing pre-recorded messages or music.

The portability and ease of use of megaphones make them an invaluable tool for public addressing, ensuring that important messages can be heard clearly and effectively, even in noisy or crowded environments.