Software Diagram

Software

1. OS

   • An operating system helps you to interact with your computer and makes the computer's language understandable to you.
     • A computer would be useless without an operating system.
     • Transfers data between CPU and memory locations
       • Produces monitor's visual display
       • Controls input and output devices
   • Some examples are:
     • Mac OS
       • iOS
         • Windows
           • UNIX

2. GUI

   • Navigated by a computer mouse
     • Contains graphics and icons
   • Parts of a GUI:
     • Windows
       • Icons
         • Menus
           • Pointer
             • Desktop
   • Graphical User Interface

3. CLI

   • Require commands to be typed on a keyboard
     • Commands are often shortened using abbreviations or short sequences
     • Is not user friendly
   • Command Line Interface

4. Multiple Users and Multi - Tasking

   • Computers can now do more than one process at once
     • Most modern OS let multiple users use them
       • Several people can use a computer without rebooting it

5. Security

   • OS must prevent users from clashing
     • Must prevent people from accessing other user's private files
       • Divides memory into sections and keeps a log of which users and processors are using which pages
         • Some files are stored centrally and are available to all users of the system