Microphones
A microphone is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.
Application
Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture production, live and recorded audio engineering, in radio and television broadcasting and in computers for recording voice, VoIP, and for non-acoustic purposes such as ultrasonic checking.
When using with a computer it can be used for recording of voices for presentation software.