A microphone is a device used to convert sound waves into electrical signals. It is used extensively in a variety of different audio applications including recording studios, live sound systems, and PA systems. Microphones can vary in size and construction, but most contain a diaphragm and magnet that vibrate in response to sound waves and then produce an electrical signal. Different microphone types and polar patterns can be used for different applications such as capturing vocals, instruments, percussion, as well as ambient and environmental sounds. Microphones can also be used to amplify sounds where natural sound sources are not loud enough.