An analog computer is one which can perform multiple calculations at once and can cope with infinite fractions of numbers. The term analog does not relate to how the computer is powered and it is possible to have electronic analog computers. The characteristics of an analog computer mean it can be better than a digital computer at particular tasks.
A computer is simply a machine which processes data in a set fashion or, to put it another way, calculates. Today most computers are digital and work by reducing all data to binary numbers before processing. Analog computers go back thousands of years but vary from digital computers in only two fundamental ways.
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