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    1                            Computer Devices

                          Goal Glimpse

                             Input Devices                                   Processing Device

                             Output Devices

                     A computer follows three different steps to perform a task. These steps are input,
                     process and output. This is known as the Input-Process-Output cycle (IPO cycle).

                     We use a keyboard or a mouse to give input to a computer. The CPU processes the
                     input. The monitor shows the output.

                                             INPUT               PROCESS                OUTPUT

                     These different parts function together and form a computer system. A computer

                     system is made up of two types of parts—Hardware and Software.

                        The parts of a computer that you can see and touch are called Hardware.
                        A computer needs instructions to do anything. These step-by-step instructions

                        are called software.

                     The parts of computer, associated with hardware and software are called computer
                     devices. There are three types of computer devices:

                        Input devices

                        Processing device

                        Output devices

                           INPUT DEVICES

                     A computer accepts data and instructions from you through input devices. Data
                     can be in the form of numbers, text, sound or graphics.

                                                                                                 Computer Devices         7

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