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Unit-3 ICT Skills-II



                                    INFORMATION TECHNOLOGY                                             3


                                          AND COMMUNICATION









                   A computer’s operating system coordinates the resources of hardware, software and humanware.
                   An operating system refers to the set of programs that provides an interface to use the resources
                   of computer system effectively and e ciently. It begins itself and is executed when a computer is
                   switched ON.






















                    he operating system sets the standard for the application programs that run on the computer.
                    pplication programs used on the computer have to be written in such a way that they operate in
                   proper coordination with the operating system.

                    he operating system performs basic tasks  such as booting the system  recognising input  sending
                   output  keeping track of location of files and directories on the disk  controlling peripheral devices
                   such as disk drives  printers  etc.


                                                     APP APP
                                                     APP  APP


                                                              Operating
                                                               System




                                                         Operating System

                   It acts as  messenger  between the computer hardware and the application programs by ensuring
                   or establishing a connection between the application and the hardware device  such as a printer
                   attached to a computer.



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