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Some of the operating systems are explained below:

              UNIX
              Unix  is  one  of  the  oldest,  reliable,  and  powerful  Operating  Systems  developed  at  AT&T's  Bell
              Laboratories in the early 1970's. It has a simple user interface called Shell, which interacts with the
              kernel to execute tasks. Some of its important features are:
              •  It has a character user interface.                                                            Unix
              •    It supports multiuser and multitasking. Several users can run multiple programs or processes simultaneously on
                 one system.
              •  It has machine independent architecture written in high level language.
              •  It has a hierarchical file system to represent information.

              Disk Operating System (DOS)
              After UNIX, DOS is one of the most commonly used Operating Systems. It was written originally by Tim Patterson—Father
              of DOS and owned by Seattle Computer Products. Microsoft released it with an IBM PC as MS-DOS 1.0 in 1982.





















                                                                 DOS
              It has the following important features:
              •  It is a single-user operating system.
              •  The user interacts with the OS in a text-mode environment.
              •  It does not support a graphical interface, so the mouse cannot be used as an input device.
              •  Basic file management functions like creating, renaming, copying, moving, deleting, etc. can be easily performed at
                "Command Prompt".

              Windows
              The first version of Windows, launched by Microsoft in 1985 which
              was an extension of the Disk Operating System. The most important
              change is the support of Graphical User Interface where mouse as an
              input device played a very important role. Following are some of its
              important features:
              •   Initial versions supported single user at a time but now new versions
                support both single user and multi users at a time.
              •  It has multitasking features.
              •  It has a Graphical User Interface where the user can get its work
                done by a few simple mouse clicks.
              •  It provides easy access to the Internet.                                    Windows 11


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