X uses a client-server model: an X server communicates with various client programs. The X client-server model and network transparency
The X.Org Foundation leads the X project, with the current reference implementation, version 11 release 7.1, available as free software under the MIT License and similar permissive licenses. The current protocol version, X11, appeared in September 1987.
X's usage of the terms "client" and "server" reverses what people often expect, in that "server" refers to the user's local display ("display server") rather than to a remote machine. X features network transparency: the machine where application programs (the client applications) run can differ from the user's local machine (the display server). As such, the visual styling of X-based environments varies greatly different programs may present radically different interfaces. X does not mandate the user interface – individual client programs handle this. X provides the basic framework for a GUI environment: drawing and moving windows on the screen and interacting with a mouse and/or keyboard. It provides the standard toolkit and protocol to build graphical user interfaces (GUIs) on Unix, Unix-like operating systems, and OpenVMS, and is supported by almost all other modern operating systems. In computing, the X Window System (commonly X11 or X) is a protocol and associated software to provide windowing on bitmap displays.
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