A computer is an electronic device that can perform a variety of operations in accordance with a set of instructions called program. Computers have made great inroads in our everyday life and thinking. They are put to use for all sorts of application ranging from complex calculations in the field or frontline research, engineering simulations down to teaching, printing books and recreational games. The ease with which computers can process data, store and retrieve it painlessly has made them inevitable in office and business environments.
The areas of application of computers are confined only by limitations on human creativity and imagination. In fact any task that can be carried out systematically can be performed by a computer. Therefore, it is essential for every educated person today to know about a computer, its strengths, its weaknesses and its internal structure. Computers have the ability to access and process data millions of times faster than humans can. A computer can store data and information in its memory, process them and produce desired results computers can do a lot of different tasks such as playing games, railway reservation, weather forecasting, error detection and controlling the flight of a space aircraft etc.

Major components of computer are:
The hardware: It includes input devices, output devices; CPU, hard disk etc are computer hardware.
The Operating System: An operating system is a program which acts as an interface between a user and the hardware (i.e. all computer resources).
The Application program routines (compilers, linkers, database management systems etc.
The Human ware (users).
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just plug and play. Without computers and internet the world may cripple, there use is very important for human survival.

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