The purpose of a command-line interface (CLI) in computing is to provide a text-based interface for users to interact with the operating system or software applications. Users can execute commands by typing them into the CLI, allowing for more precise control and automation of tasks compared to graphical user interfaces (GUIs). This interface is particularly favored by developers and system administrators for its efficiency in executing bulk commands, scripting, and troubleshooting. Additionally, CLIs are often more resource-efficient, making them suitable for remote management in server environments.