Monitor of a computer.

Computer components.

Also known as cathode ray tube!!

What is it?

A monitor is the screen of a computer. Another term for display screen. The term monitor, however, usually refers to the entire box, whereas display screen can mean just the screen. In addition, the term monitor often implies graphics capabilities.
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You plug the video into the monitor which is connected to the computer hard drive

Who invented it first?

Allen B. Dumont was the first to invent the computer screen (cathode ray tube.), but it was black and white. In 1920. Mark Dean was the second to invent the screen but in colour. This was in 1957.

Allen B.Dumont

Allen Balcom DuMont, also spelled Du Mont, was an American electronics engineer, scientist and inventor best known for improvements to the cathode ray tube in 1931 for use in television receivers.
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Mark Dean

Mark E. Dean is an American inventor and a computer engineer. He was part of the team that developed the ISA bus, and he led a design team for making a one-gigahertz computer processor chip.
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