A command-line interface allows users to input text commands to manage computers through a text-based interface rather than a graphical user interface. It is commonly used by administrators to control and automate systems. There are advantages to using a command-line interface such as not requiring any specific program, being more secure than a GUI, and being more efficient for entering commands. The command-line interface can be used through a terminal window or command prompt to type commands and execute programs or to write automated scripts.