X.Org

X.Org, or simply X, is one of the reference implementations of the X Window System, the most popular display server among Linux users, and the project operating organisation is X.Org Foundation.

Historical background

X.Org Foundation is a confluence of X and XFree86 developers.

Installation

You can install the display server, xorg-server^extra package.
Also, you can install xorg^group if you want a complete set.