Based On Size/Speed

Super Computer
Super computers are the most powerful and faster of all computer system. Supercomputer are even faster then the mainframes. The supercomputers are being used in the complex scientific calculations and research project. The supercomputers are important innovation in history of computer. They may be employed in massive data processing, solving very complex problems. Supercomputers are used in weather forecasting, rock launching, seismology, nuclear physics, weapon research and so on. The cost of these computers are very high (more than 15 million dollars). CRAY I, CRAY X-MP, HITAC S-300 etc. are the popular super computers.






Mainframe computer
Mainframe computer is larger than mini computer and smaller than supercomputer. It is very popular in database field. It is also applied as web server. It can support more than 1000 processors at the same time.





Micro Computer

A computer which is based on the microprocessor, is called a microcomputer. It is small, low cost digital computer. Microcomputer has a microprocessor on a single chip, which is its Central Processing Unit(CPU). It also has other units like input devices memory unit. It is also called personal computer. IBM PC, Apple macintosh etc. are the microcomputers.