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Some of its important features are:
               • It has a graphical user interface.

               • Free and open source operating system. Anyone with GNU General Public License (GPL) can run, modify and
              even sell the software.
               • It supports multiuser and multitasking. Several users can run multiple programs or processes simultaneously on
              one system.
               • It has a hierarchical file system to represent information.
            Different variants of Linux are available in the market like Red Hat, Ubuntu, Arch Linux etc.




                         Brainy Fact


                Only 2 out of top 500 Supercomputers run on Windows, 485 are on Linux.




            Mobile Operating System

            Mobile Operating Systems are designed to run the applications and other programs on smartphones, tablets,
            smart watches or other portable devices. It is a combination of an operating system and communication
            technology.
            Some of the important features are:
               • It has a graphical user interface with menus and buttons supporting different types of apps.
               • It has a strong multitasking feature.
               • It allows a device to easily interact in short distance or long distance communication.
               • Some of the commonly used mobile OS are Android, iOS, Windows OS etc.














                         Android                          iOS                         Windows Mobile OS


                    Types of Operating Systems

            There are different types of operating systems. The operating system can be categorised on the basis of control
            and application they support. Let us discuss briefly important types of operating systems.
               • Single-user Operating System: This type of operating system allow only one user can access the computer
              system at a time. The most commonly used single-user operating systems are Palm computer and DOS.
               • Multi-user Operating System: In this type of operating system, multiple users can use the computer at the
              same time. Examples of multi-user operating systems are Linux, Windows, etc.
               • Multi-processor Operating System: A multi-processor operating system has more than one Central Processing
              Units (CPUs) to manage the functioning of the computer. All these CPUs are able to communicate with one
              another to coordinate operations. This type of operating systems provide higher speed and capable to run
              multiple applications at the same time.

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