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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.

                    Real Time Operating System: It provides certain capabilities like control machine, instruments
                    and industrial system within specified time period.
                 Programming Software

                 It is the software used by the computer to understand and convert the instructions written in
                 programming language into machine language. Compilers, assemblers, debuggers, interpreters,
                 etc. are examples of programming software.
                 Utility Software                       Clickipedia

                 Utility  software  are  provided  as  a
                 part of operating system. They are       Programming and Computer Software,  founded in
                 specifically designed to manage the      1975, is devoted  to provide  solutions  to problems
                 computer     hardware,    operating      in  all areas  of  computer  science:  operating  systems,
                                                          compiler  technology,  software  engineering,  artificial
                 system  and  application  software.
                                                          intelligence, etc.
                 Some of the utility software are:
                      Backup utility: It is used for keeping the backup files for emergency. Windows Backup and
                      Restore is the default Windows backup utility.

                      Data Compression Program: It is used to compress a large file
                      into a file of smaller size so that it occupies less space and is easy
                      to store. WinZIP and WinRAR are examples of these software.
                                                                                                WinZIP     WinRAR
                      Disk Defragmenter: The memory of a computer is divided into
                                                                                             Data Compression Program
                      small blocks. The files are stored in continuous blocks of space.
                      When a file is deleted from the computer, a part of that space becomes free. When a new
                      file is saved on the computer, some part of it is saved

                      on the first available free space in the memory. After
                      some time, the files get stored in various fragments
                      which slows down the speed of the computer. The Disk
                      defragmenter  organises  the  fragments  of  files  into
                                                                                   Fragmented Disk  Defragmented Disk
                      continuous blocks  to improve performance  of the
                                                                                           Disk Defragmenter
                      computer.
                      Virus Scanner: It is used to scan the computer for viruses among

                      files and folders. It scans the disk each time you insert it into a
                      computer or whenever the computer is booted. It is also called
                      antivirus software.  Quick  Heal,  Norton, etc. are examples  of
                                                                                                  Virus Scanner
                      these software.
                 Clickipedia



                   Booting is a process that loads the operating system and prepares the system for use.



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