ok From what I've seen and read (which isn't much at all) I think I'm beginning to see what some of this is. But please someone still answer the question.

Xserver: something that running the X-window software ?
Xmodule: something that changes the server in order to work best with certain hardware ?
X11: A GUI interface for the computer (is this what I see when I first did VNC over knoppix with the grey back round a command line in the corner?) in which to start and use GUI programs ?
desktop managers: programs that ride over top X11 to provide a more full GUI experience to start and run programs as well as other tasks ?

Like I said someone please still answer my question.