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                                   Minicomputer
A minicomputer is a type of computer that possesses most of the features and capabilities of a large computer but is smaller in physical size.
A minicomputer fills the space between the mainframe and microcomputer, and is smaller than the former but larger than the latter. Minicomputers are mainly used as small or midrange servers operating business and scientific applications. However, the use of the term minicomputer has diminished and has merged with servers. 
A minicomputer may also be called a mid-range computer.



                                            Microcomputer
A microcomputer is a computer with a central processing unit (CPU) as a microprocessor. Designed for individual use, a microcomputer is smaller than a mainframe or a minicomputer.
The term microcomputer is not as commonly used as it was during the 1970s-1980s. We now refer to microcomputers as, simply, computers, or personal computers (PC).
 
Supercomputers are one of the fastest computers currently available. Supercomputers are very expensive and are employed for specialized applications that require immense amount of mathematical calculations numbercrunching. For example, weather forecasting, scientific simulations, animated graphics, fluid dynamic calculations, nuclear energy research, electronic design, and analysis of geological data e. g. in petrochemicalprospecting
 
                                                  Mainframecomputer

Mainframes are a type of computer that generally are known for their large size, amount of storage, processing power and high level of reliability. They are primarily used by large organizations for mission-critical applications requiring high volumes of data processing. In general, there are a few characteristics of mainframes that are common among all mainframe vendors: Nearly all mainframes have the ability to run (or host) multiple operating systems. Mainframes can add or hot swap system capacity without disruption. Mainframes are designed to handle very high volume input and output (I/O) and emphasize throughput computing. A single mainframe can replace dozens or even hundreds of smaller servers

                                              Supercomputer

Supercomputers are one of the fastest computers currently available. Supercomputers are very expensive and are employed for specialized applications that require immense amount of mathematical calculations number crunching. For example, weather forecasting , scientific simulations, animated graphics, fluid dynamics calculations , nuclear energy research, electronic design, and analysis of geological data e.g. inpetrochemical prospecting.

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