What is the primary difference between CLI and GUI?

The primary difference between Command Line Interface (CLI) and Graphical User Interface (GUI) is that CLI uses text-based commands to interact with the computer system, while GUI provides a visual interface that includes elements like windows, icons, and buttons. In a CLI environment, users enter specific commands in text form to execute tasks, which can allow for greater control and automation, particularly for advanced users or in programming environments where speed and precision are important. On the other hand, a GUI facilitates user interaction through graphical elements, making it more accessible for the average user, who may prefer to click on icons rather than typing commands. This distinction in interaction models fundamentally defines how users engage with their systems in either environment.