A computer is an electronic device that processes data into an output and displays it on the screen. The main part of the computer is it’s CPU, also known as the brain of the computer. CPU means Central Processing Unit. It sends the computer instructions and then the computer analyzes and displays it on the screen. The data which it sends to the computer is called to Input and the letters, pictures and videos it displays is known as the output. The basic devices needed to operate the system are (1) the mouse (2) a keyboard (3) a webcamera (4) a printer (5) a pair of speakers.