A teletypewriter (TTY) is an electromechanical device that was used for sending and receiving typed messages over communication lines. It allowed users to type messages on a keyboard, which were then transmitted to another teletypewriter or printed out on paper.
In modern computing, the term "tty" has evolved to refer to terminal interfaces in Unix-like operating systems, where it represents a text input/output environment for interacting with the system. This includes command-line interfaces and terminal emulators that allow users to execute commands and view output.
