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by MadWombat 2039 days ago
TL;DR;

X11 (and X windows) is a standard and a protocol. X is a short term for X11 and X Windows Xorg is a specific implementation of X11 protocol under the GNU open source project.

Pretty much every UNIX under the sun had some kind of X11 implementation, until proprietary UNIX workstations became a thing of the past.