A megaphone is a portable device used to amplify sound, making it easier for people to hear a speaker from a distance. It typically consists of a cone-shaped body and a microphone, which captures the speaker's voice and projects it through a loudspeaker. Megaphones are commonly used in various settings, such as sports events, rallies, and emergency situations. Megaphones can be powered by batteries or electricity, and they come in different sizes and designs. Some models include features like adjustable volume and built-in sirens. They are often used by coaches, protesters, and emergency responders to communicate effectively in noisy environments.