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    COMPUTER SYSTEM

                     A computer system is made up of many parts. Each part of
                     the computer performs a different task. The computer system
                     is made up of two types of parts—Hardware and Software. The
                     parts of a computer that we use to work with the computer are
                     called devices.

                            COMPUTER HARDWARE

                     The parts of a computer that we can see and touch are called Hardware. All input, processing,
                     output and storage devices form the hardware components of a computer system. For example,
                     keyboard, mouse, etc.

                     The hardware components are divided into four groups.

                                                                   Hardware

                                                Input       Processing     Output       Storage
                                               Devices        Device       Devices       Devices

                          Input Devices

                     The devices that are used to enter data into the computer and give orders are called input devices.
                     Let us study about some of the commonly used input devices.

                     Keyboard

                     A  keyboard is  used  to  give  input  to  the  computer  by  typing
                     numbers, letters and special characters.

                                             Mouse
                                             A mouse is used to send instructions to the computer with the click of a
                                             button. It is also used to draw pictures and select objects in the computer.

                                             It is also called a pointing device.

                     Scanner

                     A scanner is used to read paper documents, images or pictures and send
                     them as input into the computer.

                                                              Computer System Organization - Hardware, Software & Memory  37

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