A command-line interface (CLI) is a way of communicating with a computer by entering text-based commands. However, there are several synonyms that are commonly used to refer to a CLI. Some of these synonyms include console, shell, terminal, prompt, and command prompt. Regardless of the term used, a CLI provides users with greater control and flexibility over their computing activities, particularly when compared to graphical user interfaces (GUIs). While GUIs are often preferable for beginners or those who prefer a visual interface, power users often turn to CLIs for greater efficiency and precision in executing commands. So, whatever you like to call it, mastering the command-line interface is an important skill for any serious computer user.