Joomla! Documentation™

The "J2.5" namespace is a namespace scheduled to be archived. This page contains information for a Joomla! version which is no longer supported. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.

Lots of things.

...and:

• New Access Control System - Allows site administrators control over who can view and manage content.
• Unlimited Depth Organizational Model - Gives site administrators and content creators user-defined category levels that allow for the creation of a category tree with as many or as few levels for organizing articles and other content as needed.
• One-Click Extension Updates - Allows users to keep sites secure and controlled by simplifying the process of updating extensions.
• Semantic XHTML Layouts - Provides a better baseline for content presentation.