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· Supercomputers are the most complex  computers.
· Are used by people who need to process complex.
· Need to large amounts of data.
· Are used to solve complex numerical problems.
· Used to make forecasts.
· Used to analyse scientific or engineering problems.
· They usually have more than one CPU (central processing unit)

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· Are large and expensive
· They have powerful processors and very large memories
· Hundrest of people can work at the same time with the mainframe computers

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· Minicomputers are smaller and cheaper than mainframe computers and have less precessing power

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·Microcomputers are also called desktop computers or personal computers

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· Laptop computers are smaller but costlier than desktop computers
· They are also called notebooks.

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· Tablets are used to organize information: play games and read e-books
· Nowadays they are like very small computers that we can always carry on

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· An embedded computer is a microprocessor that is fitted into a device to control this operation