The Command Line is a text-based interface used to interact with a computer's operating system. Instead of using a graphical user interface (GUI) with buttons and icons, users type commands to perform tasks such as navigating files, running programs, or managing system settings. This method can be more efficient for experienced users, as it allows for quick execution of complex commands. Many operating systems, including Windows, macOS, and Linux, provide a command line interface. Common command line tools include Terminal for macOS and Linux, and Command Prompt or PowerShell for Windows. Learning to use the command line can enhance productivity and provide greater control over the system.