1. Categories Software
1.1. Open source software
1.1.1. create by unpaid volunteers,begin to gain wide acceptance among computer users
1.1.2. freely
1.2. Propriety software
1.2.1. privately owned and limited to a specific vendor or computer model.
1.2.2. license/paid
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3. System Software
3.1. Utility program is a type of system software that allows a user to perform maintenance-type task
4. Application Software
4.1. Application software consists of programs designed to make users more productive and assists with personal tasks
4.2. Types of Application Software
4.2.1. Web Browser
4.2.2. Word Processing
4.2.3. Spreadsheet
4.2.4. Database
4.2.5. Presentation
5. Utility programme
5.1. Types of Utility Program
5.1.1. File Manager
5.1.2. Disk cleanup
5.1.3. Compression Tools
5.1.4. Anti-virus program
5.1.5. Spyware program
5.1.6. Disk Defragmenter
5.1.7. Backup and Restore
6. Operating System
6.1. An operating System (OS) is a set of programs containing instructions that work togehter to coordinate all the activities among computer hardware resorces
6.2. Type of operating system
6.2.1. Stand Alone Operating System
6.2.1.1. properiety software
6.2.1.1.1. Windows
6.2.1.1.2. Mac OS X
6.2.1.2. Open source software
6.2.1.2.1. Unix
6.2.1.2.2. Linux
6.2.1.2.3. Ubuntu
6.2.2. Server operating System
6.2.2.1. properiety software
6.2.2.1.1. Windows server 2008
6.2.2.1.2. Netware
6.2.2.2. Open source software
6.2.2.2.1. Unix
6.2.2.2.2. Linux
6.2.2.2.3. Solaris
6.2.3. Mobile Operating System
6.2.3.1. properiety software
6.2.3.1.1. Windows Embedded
6.2.3.1.2. CE
6.2.3.1.3. Windows Phone 7
6.2.3.2. Open source software
6.2.3.2.1. Google Android
6.2.3.2.2. Embedded LInux
6.2.3.2.3. Symbian OS
6.3. Function On Operating System
6.3.1. Start and shutdown the computer
6.3.2. provide a user interface
6.3.3. manage program
6.3.4. manage memory
6.3.5. establish an internet connectin
6.3.6. monitor performance
6.3.7. control a network