Input
The devices that are used to enter data and instruction into the computer system area called input devices.
Keyboard, mouse, scanner and camera are the example of input devices.
Output
The devices that are used to receive processed data from the computer are called output devices.VDU(Visual Display Unit), printer, are example of output devices.
What is dual?
A device which is used from input and output at the same time called dual. Touch system is an example of it.
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