Peripherals

Monitor
It is used to provide visual output from a computer, cable box, video camera, VCR or other video generating device.
It is was you are probably reading this site from.

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Keyboard
A keyboard is basically a board of keys.
Along with the mouse, the keyboard is one of the primary input devices used with a computer.

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Mouse
An input device that is most often used with a computer.
Moving a mouse along a flat surface can move the on-screen cursor to different items on the screen.