According to functionality, computers are classified as : Analog Computer     An analog computer ( spelt analogue in British English ) is a form of computer that uses continuous physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved Digital Computer   A computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system Hybrid Computer (Analog + Digital)   A combination of computers those are capable of inputting and outputting in both digital and analog signals. A hybrid computer system setup offers a cost effective method of performing complex simulations. On the basis of Size  Super Computer The fastest and most powerful type of computer Supercomputers are very expensive and are employed for specialized applications that require immense amounts of mathematical calculation...