Extensible markup language that defines a format that is both human-readable and machine-readable. XML files are used in Joomla for installation files, options, and JForm forms.

The template used to specify the layout of the administrator back end of a Joomla site. The Back-end Template controls the way your website's administrative tasks are presented for controlling management functions by a Joomla! Administrator. These would include common tasks such as: user, menu, article, category, module, component, plugin and template management.