The literal meaning of the word computer is an instrument that does various calculation. It is a wonderful electronic devic for storing. analysing and emitting data. It has no capacity to do anything by itself. It wrks on the basis of commands given by the operator. the history of its invention is very long and none can claim to be its sole inventor. From pascal to Haward Akin numerous scientists contributed to its invertion and still it is being enriched by many other scientists. A computer consists of five major components. they are the input unit, The output unit, the memory unit, the control unit and the arithmetic unit.A computer performs three functions. At first it receives data. Secondly, it processes data by various computations and thirdly its emits data. The fastest computer can handle milliions of problem in a few seconds. It can perform many operations at a time. Computer is of great use to us. It is like aladin's magic lamp or magic word. It has lessend our work loads and made our life easy and comfortable. It is already used in industries, universities, offices and many other places, yet it is not an unmixed blessing. It weakens the eyesight of the operator sometimes the young ones get addicted to using computer for games and sports. though the world is far advanced with computer, Bangladesh is at its initial stage with it. So we should try to develop this sector here.
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