introduction of input and output devices

 Introduction of input and output devices:

• A computer interacts with the external environment via the input-output (I/O) devices attached to it.
•  Input device is used for providing data and instructions to the computer.
•  After processing the input data, computer provides output to the user via the output device.
•  The I/O devices that are attached, externally, to the computer machine are also called peripheral devices.
•  Different kinds of input and output devices are used for different kinds of input and output requirements.