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1. The low-level software that supports a computer's basic functions, such as scheduling tasks and controlling peripherals.

   • Process Manangement
     • Manages The CPU - Runs applications and executes and cancels processes
     • Multi-tasks - Allows multiple applications to run at the same time
   • Utilities Software

2. File Management

   • Hierarchy System
   • Recognise files and directories

3. Hardware Management

   • Manages peripherals - opens, closes and writes to peripheral devices such as storage attached to the computer.
   • manages memory - transfers programs into and out of memory, allocates free space between programs, and keeps track of memory usage.
   • Drivers - Software that is used by the OS to control a device.

4. User Management

   • User Interface - Provides a user interface, an environment for the user to interact with the machine
     • Graphical User Interface (GUI)
       • The OS on most computers and smartphones provides an environment with tiles, icons and/or menus. This type of interface is called the graphical user interface (GUI) because the user interacts with images through a mouse, keyboard or touchscreen.
     • Command Line Interface (CLI)
       • An OS also provides a method of interaction that is non-graphical, called the command line interface (CLI). This is a text-only service with feedback from the OS appearing in text. Using a CLI requires knowledge of the commands available on a particular machine.

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