TTY (Teletypewriter)

TTY (Teletypewriter) originally referred to physical devices used for input and output between users and computers. In modern computing, especially in Unix/Linux systems, a TTY is a virtual terminal that emulates these older devices, allowing users to interact with the system via command-line interfaces. Terminals like /dev/tty1, /dev/tty2, etc., represent different sessions or consoles. TTYs are essential for low-level system access, especially when the graphical interface is unavailable or disabled.