A terminal is a text-based interface that allows users to interact directly with a computer's operating system by typing commands. Unlike graphical user interfaces (GUIs), terminals display only text and require users to input instructions via a keyboard. They are commonly used by developers and IT professionals for coding, system administration, and troubleshooting tasks, as they provide powerful access to system functions and automation through command-line tools. Terminals can be found on most operating systems, including Windows, macOS, and Linux, and are essential for many cybersecurity and programming activities.