Computer is the most wonderful achievment of science. Genral people cannot understand what type of thing it is. The most impossible work which is out of the approach of human mind is done by the computer. Now a days the computer is found in every office. The most axact calculation can be made in no time with the help of the computer. The weather forecast, medical diagonosis and missile control are also made by the computer. ROBBOT is also operated by the computer. Robbot is also a miraculous invention of science. It dose all the works which a man can do. Sometimes it dose the work which comman man cannot do. The coputer has been very much popular and useful now a days. But its story is very old. In 3000 B.C. Abcus found a machanical device for addition and subtraction of any digit and number. In 1671 Leibnizs found a calculator that could perform a multiply and division. In 1804 Joseph jackward, a frech scientist developed a loop. In 1833 Charles Babbage was the another genious in the history of computer who made a machine called DIFFERETIAL ENGINE. This machine could calculate any type of mathematical equation. Charles Babbage is known as the 'FATHER OF COMPUTER'. In INDIA bhabha atomic research center invented in 1979, such a hand which could work on singal. In 1980, HYDERABAD science society tired to make robbot. In 1983, this society made a 'child robbot the third' I.B.S. Company, Banglore made a micro-computer for domestic work and about 16 thousand to 32 thousand words may be stored in its memory. The computer is a rectangular television like structure. It has also a screen like T.V. screen on which we can see and read whatever we require. There is a key-board. The key-board is an instrument through which we operate the computer. Its structure is like a type writer machine. Through key board, file is prepared or something is set in the memory of the computer. The another instrument is a printer. Whatever we set in the memory of the computer or the file which we prepare, may be had in the printed from through printer. The other instruments are C.P.U, mouse, etc. The computer may be divided in two ways- 1. On the basic of function and 2. On the basis of size. On the basis of function it has two kinds- a) software and b)hardware. On the basis of size it is divided into a)micro computer b) mini computer c) super computer. The utility of the computer is very wide. It is used in almost all the areas:- business, education, angineering, medical and scientific research. Its functioning is very quick and exact. In life insurence corporation or bank, computer are in frequent use. The computer can do the work of so many people and so many people and so many days in one day. The computer is no doubt a very useful instrument. It is perhaps the climax of the scientific achievement. It has its own importance in the development in the human race. But in India, a highly populated country, it reduces the job opportunity. A computer dose the work of many people in one day. So many people remain unemployed. The scope and function of the computer should be developed so that it may work even in the agriculture field. It may also be operated by the peasants and farmers of the villages. Proper training should be given to the common people. The computer should come out of the offices to the field.