1-In simpe word a computer is a electronic machine that is able to take information (input), do some work on or make changes to the information (process), to make new information (output). There are four main processing steps in a computer, and they are: inputting, outputting, storage and processing.
2-A computer user can control it by a user interface.input device include keyboard, mouse, buttons,touch screen. Some very new computers can also be controlled with voice commands or hand gestures or even brain signals through electrodes implanted in the brain or along nerves.
3- A computer is only useful if it has both hardware and software. Hardware is the physical parts the computer is made of - for example keyboard, mouse, screen, tower, and the circuits inside it. Software is the computer programs (mathematical instructions). The software uses the hardware, when the user gives it instructions, and gives useful output.
4- Some input and output devices are :
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