X Terminal or X Server

An X terminal is an electronic display terminal that communicates with a host computer system using the X Window protocol developed at the Massachusetts Institute of Technology.

The X Window protocol allows a program running on the host computer system to display both formatted text and graphics on the X terminal. Since the X Window protocol is defined to work over any TCP/IP network, X terminals connected to the Internet can be connected to hosts located anywhere on the Internet.

Personal computers (including both PCs and Macintoshes) can execute programs, usually called X servers, that make them act like X Window terminals and are frequently used as X terminals.

The terminology used to describe processes associated with X terminals can be confusing. An X terminal is also known as an "X display server," and the program running on the host computer is usually known as the "X client."