Ars technica looks
at the history of X and the birth of Wayland. "A key feature of Wayland is the use of a rendering API that does not have any dependencies on X. To maintain compatibility, the X Server itself is made into a Wayland client, and all of the X rendering is fed directly into Wayland. The Wayland package, like X before it, defines a protocol only. The architecture of Wayland, with its ability to function alongside X, provides an easy migration path for existing and even future planned X clients. The X Server can run as before, servicing all of the legacy clients.
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