1.What is X window?
It is a “graphical interphase” on “linux” and “unix” like systems which is used to display graphics
which are helpfull in software installation.
The X server listen to the connections from X client applications.
2.In order to get X windows working there are few system packages that are required to be
installed on the server.
Like: xorg-x11-apps-7.7-6.e16.x86_64(version may very from OS to OS).