Before the 20th century, most calculations were done by humans. Early mechanical tools to help humans with digital calculations were called "calculating machines", by proprietary names, or even as they are now, calculators. The machine operator was called the computer.
The first aids to computation were purely mechanical devices which required the operator to set up the initial values of an elementary arithmetic operation, then manipulate the device to obtain the result. Later, computers represented numbers in a continuous form, for instance distance along a scale, rotation of a shaft, or a voltage. Numbers could also be represented in the form of digits, automatically manipulated by a mechanical mechanism. Although this approach generally required more complex mechanisms, it greatly increased the precision of results. The invention of transistor and then integrated circuits made a breakthrough in computers. As a result, digital computers largely replaced analog computers. The price of computers gradually became so low that first the personal computers and later mobile computers (smartphones and tablets) became ubiquitous.
After the 20th century an electronic machine was made named as COMPUTER which was so fast for calculation and store the data.
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