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1.Computer hardware is the collection of physical parts of a computer system. This includes the computer case, monitor, keyboard, and mouse. It also includes all the parts inside the computer case, such as the hard disk drive, motherboard, video card, and many others. Computer hardware is what you can physically touch
2.A machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action. ... They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
3.A keyboard is for putting information including letters, words and numbers into your computer. You press the individual buttons on the keyboard when you type. The number keys across the top of the keyboard are also found on the right of the keyboard. The letter keys are in the centre of the keyboard.
4.Computer is a very smart machine because it can perform any task like calculations, watching movies, playing games etc
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