Modules are small blocks of content that can be displayed in positions on a web page. The menus on this site are displayed in modules. The core of Joomla! includes 24 separate modules ranging from login to search to random images. Each module has a name that starts mod_ but when it displays it has a title. In the descriptions in this section, the titles are the same as the names.
User modules interact with the user system, allowing users to login, show who is logged-in, and showing the most recently registered users.
Utility modules provide useful functionality such as search, syndication and statistics.