INTRODUCTION
Let us begin with word 'compute'. It means 'to calculate'. We are familar with calculations in our day-to-day life. We apply mathematical operations like addition, subtraction, multiplication,etc. and much other formula for calculations.Silpler claculations take less time. But complex calculations take much longer time. Another factor is accuracy in calculations.So man explored with the idea to develop a machine, which can perform this type of arthmetic calculation faster, and with full accuracy. This gave birth to a device or machine called 'computer'.
Computer is a fast and accurate electronic device that accepts data through input device then store and process them, and resulted data are displayed from output device.The computer we see today is quite different from the one made in the beginning.As mentioned in the introduction it can do arthmetic calculations faster.The number of applications of a computer has increased, the speed and accuracy of calculation has increased.For a common man computer is simply a calculator, which works automatic and quite fast.For a person who knows much about it, computer is a machine capable of solving problems and manipulating data.Therefore, we may define computer as a decive that transforms data.Data can be anything like marks obtained by you in various subjects.It can be also be name, age, sex, weight, height,etc.Human beings do calculations on their own.But computer is a dumb machine and it has to be given proper instructions to carry out its calculation. This is why we should know how computer works.