Character User Interface (CUI)
A Character User Interface (CUI) is a type of user interface that relies on typing commands and does not use a mouse for navigation. It is also commonly known as a Command Line Interface (CLI) or a Textual User Interface (TUI).

Explanation:
A CUI is a text-based interface that allows users to interact with a computer system by typing in commands. It provides a command prompt where users can enter specific commands to perform various tasks and operations. Unlike a Graphical User Interface (GUI), which uses visual elements such as windows, icons, and menus, a CUI relies solely on text-based input and output.

Key Points:
- A CUI is often used in operating systems and software applications that require direct and precise control over system resources and operations.
- In a CUI, users need to have knowledge of specific commands and their syntax to interact with the system effectively.
- CUIs are typically more efficient and faster for experienced users who are familiar with the commands, as they can quickly enter commands without the need for mouse navigation or graphical elements.
- CUIs are often used in programming and system administration tasks, as they provide a more direct and powerful way to interact with the underlying system.
- Examples of CUIs include the command prompt in Windows, the Terminal in macOS and Linux, and various programming environments and development tools.

Advantages of CUI:
- CUIs are often more lightweight and require fewer system resources compared to GUIs.
- They can be used in environments where graphical interfaces are not practical or available, such as remote server administration or embedded systems.
- CUIs can provide more precise control and flexibility for advanced system operations and scripting tasks.

Disadvantages of CUI:
- CUIs have a steeper learning curve for inexperienced users, as they require knowledge of specific commands and their syntax.
- They can be less intuitive and user-friendly compared to GUIs, especially for tasks that involve complex interactions or graphical elements.
- CUIs may not provide visual feedback or immediate visual cues, making it harder to understand the system state or errors without reading the textual output.