There are five main kinds of computers based on size: PC (Personal Computer), minicomputer, microcomputers, supercomputers, and mainframe. Additionally, there are three different kinds of computers based on their capacity to manage data: A computer can be digital, hybrid, or analog.

A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation). Modern digital electronic computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks.

A computer is an electronic device. Charles Babbage first invented the computer. Computers play an extremely important function in our life. The machine takes in data as input, processes it, and gives output.

A computer is an electronic device, operating under the control of instructions stored in its own memory that can accept data (input), process the data according to specified rules, produce information (output), and store the information for future use1. Any kind of computers consists of HARDWARE AND SOFTWARE.