what is CD-ROM?define by the microphone and modem?

what is CD-ROM?define by the microphone and modem?

Microphone:                           you must be familial with the microphone that is used with the public address system at public functio... 01:37

Microphone:
                          you must be familial with the microphone that is used with the public address system at public functions. the microphone that is also called a mike is used to convert the speech or voice into electronic signals that can be carried through cable to any distant place. the same microphone can be used with the computer also if your computer has a sound sandblaster.

when you speak on the microphone your voice changes into electronic signals ans goes into the computer. thus you can record your voice in the computer and you can even add various effects in it like echo.
CD-ROM:
                  compact disk-read only memory is a disk that holds the computer programs as well as the audio and video. to run a audio, video or program CD you must have a CD-ROM drive (A machine that plays the CD) in your computer.

1. if you want to see a movie or film or your want to add some new software into the computer, or your want to learn some software, etc., then you can insert the video CD related to that topic into the CD-Drive and play it to get your work done.

MODEM:
                   MODEM is short form of modulator and demodulation. this is used to convert the computer (Digital) signals into telephonic (Analog) signals that can be carried through telephone lines to any distant place. On the other end the modem convert them into their original form (Digital).
Thus MODEM behaves as a matador between two or more computers. if your computer is connected with the network or internet, the MODEM will play a very important role in data communication.