X Window System in Fedora
X.org is an open source implementation of the X Window System. It provides the basic low level functionality Desktop Environments such as GNOME and KDE are designed upon. Previously monolithic, the modular release model of Xorg enables users to receive updates at a faster pace, and helps developers to develop and release specific components in a rapid fashion.
Please see Xorg/Debugging for information on how to file the best bug reports for Xorg in Fedora.
Xorg Additional Information
For more information about Xorg refer to the Xorg wiki at freedesktop.org.