iNpUt & OutpUT

Before a computer can process your data, you need some method to input the data into the machine. The device you use will depend on what form this data takes (be it text, sound, artwork, etc.).
Similarly, after the computer has processed your data, you often need to produce output of the results. This output could be a display on the computer screen, hardcopy on printed pages, or even the audio playback of music you composed on the computer.
The terms “input” and “output” are used both as verbs to describe the process of entering or displaying the data, and as nouns referring to the data itself entered into or displayed by the computer.They are peripheral devices used for input and output.
The example of input devices are a keyboard,pointing device,mouse,touchpad,trackpoint,joystick,touchscreen and many more.While the example of output devices are the monitor,printer,and sound output.