There are four types of digital computer , such as microcomputer mini computer, mainframe computer, supercomputer, microcomputer, microcomputer, a computer where a microprocessor acts as a CPU. Slightly smaller than microcomputers , mainframe computers and mini computers. Mini computer Mini computer refers to a machine that is the smallest in the computer world hence it is called a mini computer. Mini computer Mini computer refers to a machine that is the smallest in the computer world hence it is called a mini computer. Mainframe computers are computers that are used primarily in a variety of large organizations , working hard and processing many data simultaneously such as census , industry and buyer statistics , industrial organization asset planning and exchange. This is called a mainframe computer. Mainframe computers are computers that are used primarily in a variety of large organizations , working hard and processing many data simultaneously such as census , industry and buyer statistics , industrial organization asset planning and exchange. This is called a mainframe computer. By supercomputer we mean supercomputer, the one who has more power is called supercomputer. Supercomputers usually use two methods to work with a large number of processors. The 1st method is called grid computing and the 2nd method is called cluster computing.