Extensions
The Who's Online Module displays the number of Anonymous Users (e.g. Guests) and Registered Users (ones logged in) that are currently accessing the Web site. Help
This module shows an iFrame window to specified location. Help
This module displays a list of categories from one parent category. Help
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News Feeds (com_newsfeeds) provides a way to organize and present news feeds. News feeds are a way that you present information from another site on your site. For example, the joomla.org website has numerous feeds that you an incorporate on your site. You an use menus to present a single feed, a list of feeds in a category, or or a list of all feed categories. Help
This module allows you to display the articles in a specific category. Help
Breadcrumbs provide a pathway for users to navigate through the site. Help
The authentication plugins operate when users login to your site or administrator. The Joomla! authentication is in operation by default but you can enable Gmail or LDAP or install a plugin for a different system. An example is included that may be used to create a new authentication plugin.
Default on:
- Joomla
Default off:
- Gmail
- LDAP
Content plugins run when specific kinds of pages are loaded. They do things ranging from protecting email addresses from harvesters to creating page breaks.
Default on:
- Email Cloaking Help
- Load Module Help
- Page Break Help
- Page Navigation Help
- Rating Help
Default off:
- Code Highlighting (Geshi) Help
The banner module is used to display the banners that are managed by the banners component in the site administrator. Help.
This module displays the latest registered users. Help
The contact component provides a way to provide contact forms and information for your site or to create a complex directory that can be used for many different purposes. Help
These plugins are behind the buttons found beneath your editor. They only run when an editor plugin runs.
Default on:
- Editor Button: Image
- Editor Button: Readmore
- Editor Button: Page Break
- Editor Button: Article
Default off:
- None
The content component (com_content) is what you use to write articles. It is extremely flexible and has the largest number of built in views. Articles can be created an edited from the front end, making content the easiest component to use to create your site content. Help
This module shows a list of the calendar months containing archived articles. After you have changed the status of an article to archived, this list will be automatically generated. Help
Subcategories
Components
Components are larger extensions that produce the major content for your site. Each component has one or more "views" that control how content is displayed.In the Joomla! administrator there are additional extensions suce as Menus, Redirection, and the extension managers.
Modules
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 17 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.
Templates give your site its look and feel. They determine layout, colors, type faces, graphics and other aspects of design that make your site unique. Your installation of Joomla comes prepackaged with four templates. 
Plugins are small task oriented extensions that enhance the Joomla! framework. Some are associated with particular extensions and others, such as editors, are used across all of Joomla!. Most beginning users do not need to change any of the plugins that install with Joomla!.