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Its to see what you are doing
to use your computer you need a monitor to see what your doing.
The monitor is the box that displays all of the images you see. It is what you were looking at when you typed out this question.
to see what is happing on the computer
so u can see what you typed on the computer
It allows you to see images, words, and basically anything on your computer.
i can see original colours in desplay
To see the screen or game you are using.
No, but you wouldn't be able to see what you were doing.
The monitor is a screen used for a computer or a laptop. The one you're looking at right now to see this answer.
The switch for the computer is separate to the monitor switch. To switch on the monitor, just press the button on the bottom right of your monitor (The thing you are looking into to see this answer).
Just selling the monitor can do no harm. Nothing is saved to the monitor itself, it is only a display device and will display data of the computer to which it is attached.