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Are the most complex computers.
They are used by people how need to proces big amounts of data. They are also used to solve complex numerical problems, for people how need to proces big amounts of data, make forecasts and analyse scientific or engineering problems.

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They are large expensive and they also have large memories. They can be used by hundreds of people at the same time.

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They are smaller and  cheaper than the mainframe computers.
They use less processing power and few people can work at the same time in a minicomputer.

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The microcomputers are the most common ones, they are personal , only one person can use them at the same time.

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Portable computers.
Large battery, smaller but costlier than desktop computers.

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Is a microprocessor that fitted into a device to control it`s operation. They are installed in smart appliances and automobiles for special operations.

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Smaller and portable than the other devices.
For example tablets are
used to: play games read ebooks and organize info