The computer is an electronic device. It is recent invention of the universe. It has become an essential part of our modern life now it has greatly benefited us and brought us about revolutionary changes in our life. Any electronic device that helps people to solve mathematical calculation is generally known as computer. It becomes an essential part of our modern and present life. It greatly benefited us and brought about revolutionary changes in our life. At the very beginning some people tries to keep their record. In this connection they made a machine that is called ‘abacus.’ Today computer is using for different kind of research. Trained mathematicians are using the computer for solving problems of their field. From the calculation to printing in every section it is specially used. In an office computer is an important element of the modern office. They cannot do a single correspondence without a computer. Actually it is an electronic brain and it helps us to easy our deeds.