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  Distributed Operating System: In this operating system  processing is carried independently in more than
           one location but with sharing of computational capacity. It is accessed by a set of computers interconnected
           by a network. It gives an impression to the user that he is working on a single system.
          Real-Time Operating System: It processes instructions and produces a response within a specified time.
           It is a computing environment that reacts to input within specified time.  xample:   M  tra c signal  etc.


            FUNCTIONS OF OPERATING SYSTEM

         he operating system performs the following functions in a device which are given the following:
          Device Management:   t  the  time  of  execution  of  any  program   operating  system  directly  controls  the
           operation of the input-output  I O  devices like controlling the action of the printer    - OM drives  etc.
          Process Management: Operating system handles the scheduling  synchronisation  processing suspension and
           resumption of processes. Operating system can independently prioritise  obs for processing.

          Memory Management: It is the process of coordinating and controlling the use of memory in a computer
           system. It allocates a  ob to a free memory partition.

          Security Management: Operating system protects information and resources against unauthorised access
           using login and password.
          File Management: Operating system performs the function of retrieving, storing, renaming and protecting
           files.
          User Interface:  he operating system provides an interface to the user to access the applications  so that the
           user can easily access and use the software. It acts as an interface between the user and the hardware.


           TYPES OF OPERATING SYSTEM

         here are various types of operating systems. Some popular operating systems are:
           isk Operating System   OS                         nix
          Solaris                                           Microsoft  indows
           inux                                             M  acintosh Operating System
          Mobile Operating Systems   ndroid  Symbian   i en

        Disk Operating System (DOS)
         fter  NI    OS is one of the most commonly used Operating Systems. It was written originally by  im
         atterson Father of  OS and owned by Seattle  omputer  roducts. Microsoft released it with an I M    as
        MS- OS  .  in     . It has the following important features:

























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