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Disk  Defragmenter:  The  memory  of  a  computer  is  divided  into  small  blocks.  The  files
                    are stored in continuous blocks of space in the hard disk. 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 that slows down the speed
                    of the computer. The Disk defragmenter organises the
                    fragments of files into continuous blocks to improve the
                    performance of the computer.                                 Fragmented Disk    Defragmented Disk

                                                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 these
                         Antivirus             software.

                  Clickipedia


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


                     APPLICATION SOFTWARE


                 It is a program designed to help users perform specific tasks. It is designed to be used by
                 end-users. Generally, people refer to application software as software. Application software can
                 be broadly classified into two categories:


                                                               Application
                                                                Software




                                General Purpose Software                                    Customised Software





                         Word            Presentation         Desktop Publishing            Multimedia
                       Processors          Software             (DTP) Software              Processors


                              Spreadsheets    Database Management            Image Processing
                                                  Systems (DBMS)                 Software


                 General Purpose Software

                 General purpose software are those which have not been developed according to the needs of
                 a particular organisation or particular industry. They can be used both for  commercial and
                 non-commercial  purposes.  The  general  purpose  software  can  further  be  classified  into  seven

                 different groups on the basis of their use. They are:



                                                                                               Types of Software   9
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