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Knowledge organisers / Operating Systems

The purpose and functionality of operating systems: User interface

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Knowledge organiser

Operating Systems

1.5.1a.i

What you need to know

The operating system provides a user interface that allows users to interact with the computer. The two main types are graphical user interfaces (GUIs) and command line interfaces (CLIs).

Key points

  • Definition:User Interface: the part of an operating system that allows a user to interact with the computer, either through graphical elements or text commands.
  • Definition:GUI (Graphical User Interface): a visual interface using icons, menus, and windows that users interact with using a mouse/touchscreen.
  • Definition:CLI (Command Line Interface): a text-based interface where users type commands to interact with the computer.
  • GUIs are easier for beginners — visual and intuitive. CLIs are more powerful and efficient for experienced users.
  • Exam Tip:If asked to compare GUI and CLI, mention: ease of use (GUI easier), speed/efficiency (CLI faster for experts), and visual feedback (GUI has more).