A computer is a machine with an electronic brain. we can call it a thinking machine. It works under the instruction in a data (or information) that has been fed into it. For example, it can do calculations with numbers. It can point out the mistakes in your spellings. It can mark your answer books. It can play a game of chess with you, guide a spacecraft, check fingerprints, and draw a map of your country. It can do all these things and much more. It can do millions of calculations in seconds and normally, the results are always exactly correct.
Because computers are electronic machines, they do not have moving parts ( as a car engine has, for example). computers can go wrong. Most computers can carry out a very wide range of takes, and they can easily switch from one job to another. Because of all these abilities, computers play a bigger part in the modern world. They can perform amazing feats of calculations that are far beyond a man`s mental ability. They can also do a task over and over again without ever making a mistake. They have already taken over many dull and repetitive jobs in offices and factories. Computers are also helping us to increase our knowledge in all kinds of fields.
When stream engines and factory machines were first invented, they gave people much greater physical power to do things. They made possible the Industrial Revolution, as a result of which people`s lives were greatly changed.
The development of computers in the late 20th century has given us greater mental power. computers can do a lot of extra thinking and remembering for us -just as engines push and pull for us. Computers have already changed our way of life and work. This changed is often given the name of Computer revolution. Like the Industrial Revolution in the 1700s and 1800s, this too has changed many lives in the late 1900s-2000s. This changed is so fast that a device developed during one year begins to look obsolete the next year.
There are four kings of computers: supercomputers ( the largest), mainframes, minicomputers and microcomputers (the smallest).
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