What is Computer?
https://edu.gcfglobal.org/en/computerbasics/what-is-a-computer/1/

 

Monitor 
 

VDT (video display terminal) and VDU (video display unit), a monitor is an output device that displays video images and text. A monitor is made up of circuitry, a screen, a power supply, buttons to adjust screen settings, and casing that holds all of these components.
 

Computer mouse
It is a handheld hardware input device that controls a cursor

in a GUI (graphical user interface) for pointing, moving and selecting text, icons, files, and folders on your computer. In addition to these functions, a mouse can also be used to drag-and-drop objects and give you access to the right-click menu.

For desktop computers, the mouse is placed on a flat surface (e.g., mouse pad or desk) in front of your computer. 

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Power cord

Alternatively known as a power cable, mains cable or flex, a power cord is the primary cable that provides power to the computer, printer, monitor, and components within a computer. The image is an example of the power cord that is commonly used with computers, monitors, printers, and other peripherals.

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Keyboard is one of the primary input devices used with a computer. Similar to an electric typewriter, a keyboard is composed of buttons used to create letters, numbers, and symbols, and perform additional functions. The following sections provide more in-depth information and answers to some of the frequently asked questions about the keyboard.