A computer is an electronic device that inputs data and performs execution on it. Early computers were calculators with/without storage capability. The popular computers that were used in the early days are Abacus, Napier’s bones, Adding Machine, Jacquard’s Loom, Difference Engine, and Analytical Engine. The computer executes the instructions given by the user and produces the desired output. The four components of a computer system are an input device, a processing device, a storage device, an output device. Input devices provide ways to communicate with the computer. Processing devices store retrieve and process data. Storage devices are used to store information. Output devices receive or display output from a computer.
Computers can be classified into various categories: supercomputer, mainframe computer, minicomputer, and microcomputer. Supercomputers are used for jobs that take massive amounts of calculating, like weather forecasting, engineering design. Mainframe computers are mainly used in the banking and financial sectors etc. Minicomputers are mainly used in departmental systems, online reservations, etc. Microcomputers are mainly used in offices and as personal computers.
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