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The world wide web consortium was created to standardize the protocols and mechanisms used in the world wide web. It is thus focused on a subset of the application layer. See https://www.w3.org
WAN
Wide Area Network
X.25
A wide area networking technology using virtual circuits that was deployed by telecommunication operators.
X11
The XWindow system and the associated protocols are defined in [SG1990]_
XML
The eXtensible Markup Language (XML) is a flexible text format derived from SGML. It was originally designed for the electronic publishing industry but is now used by a wide variety of applications that need to exchange structured data. The XML specifications are maintained by `several working groups <https://www.w3.org/XML/>`_ of the :term:`W3C`