A microphone can be used a telephone, hearing aids, public address system for the concert hall and public event, radio and television broadcasting, megaphone etc.  Here this article gives information about the advantages and disadvantages of a microphone to know more details about it. 
Advantages of a microphone :
- In uses microphone greater freedom of movement for the artist or speaker
 - Reduction of cable trip hazards in the depends upon performance space
 - Avoidance of cabling problems common with wired microphones, caused by constant moving as well as stressing the cables
 - It is faster to read in text than to type it in using a keyboard type
 - It can improve both safety and security when used in the voice activation system
 - Sound can be manipulated in real time rather than a recording done at the earlier stage
 
Disadvantages of a microphone :
- Noise or dead spots
 - The limited number of operating microphones at the same time and place
 - The limited number of radio channels
 - Sound files can use up a lot of computer memory in a device
 - Voice recognition system software is not as accurate as typing manually