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A terminal is a text-based interface to a computer's operating system. It is a program that allows users to enter commands and interact with the operating system using text input and output. Terminals are commonly used to perform a variety of tasks, including running programs, accessing files and directories, and administering systems. They are often used by developers and system administrators to perform tasks that require command-line input, as well as by users who prefer a text-based interface to a graphical user interface (GUI).