Computers are an integral part of our lives. The term “computer” is derived from the Latin word ‘C omputare ’ which means to calculate and to calculate means to do mathematical or logical evaluations. Invention of the computer has made many dreams come true even we cannot imagine our lives without computer. A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program. It is designed to execute applications and provides a variety of solutions by combining integrated hardware and software components. Charles Babbage is called the "Grand Father" of the computer. The First mechanical computer designed by Charles Babbage was called analytical engine. It uses read-only memory in the form of punch cards. A computer can process data, pictures, sound and graphics. They can solve highly complicated problems quickly and accurately. Computer is an electronic device having big memory which c