This article is based on
two articles originally written for Joomla 1.6. This article was written in December 2011, prior to the release of Joomla 2.5. However, it assumed that ACL concepts will not change between Joomla versions, even if minor changes to the interface do occur. One of the most powerful new features in Joomla 1.6 and later versions is Access Control Lists (ACL). ACL stands for access control lists. It refers to who has permission to do what on the website, including read, create, edit, delete, or log in, among other permissions.