The liquid crystal displays allows a person to view images, photos, data, on their monitors. It also lets us see light, colors, movement and videos and computer games. You simply would be looking at a black screen if it weren't for the monitor technologies. This is what PC monitors do for us.
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A computer monitor is the same thing as a computer screen. It lets your computer display text, images, and videos. Without a screen you wouldn't be able to see what you are doing on the computer.
It doesn't "do" anything to them; a monitor is the thing that looks like a TV that you're looking at as you read this.
A monitor will display images generated from the video output of your computer, without producing a recording.