A program that emulates a TTY (the most common terminal standard is the vt100 terminal).

There are many graphical TerminalEmulators to provide a window with an emulator in a GUI environment. By default, a TerminalEmulator will normally start up running an interactive Shell, giving you all the power of the CommandLine.

It has been said that X11 is mostly useful because you can have many of them on screen at the same time.

Besides the Linux console itself, the default one is xterm(1); and while not particularly customizable in appearance, its terminal emulation support is very mature and complete. There are several others that do basically the same thing but add extra features (transparency, color, menu, scrollbar, etc).

Here are some of the more common ones:

• Screen
• aterm(1)?
• Eterm(1)?, part of Enlightenment
• rxvt(1) (ouR eXtended Virtual Terminal)
• gnome-terminal(1), part of GNOME
• konsole(1)?, part of KDE
• PuTTY - a Free terminal emulator for MicrosoftWindows.