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I work on your instructions.                            I can work without any
                                                                                        instruction.




















                       I cannot take my own decisions.                      I can take my own decisions.








                   The word ‘computer’ is derived from the word compute which means “to
                   calculate”.



                    Reb              t



                       The working of a computer is based on the Input-Process-Output cycle.
                        Input is giving instructions to the computer in the form of numbers, letters

                      or symbols.
                        Keyboard and mouse are input devices.

                        The data or instructions we give to the computer are called input.

                        The computer performs action on the input with the help of CPU.
                        Output is the result after processing.

                        Computers are very useful to us because of their unique features.




                                                                                Computer—An Electronic Device    13
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