Extensions
Login Module
This module displays a username and password login form. It also displays a link to retrieve a forgotten password. If user registration is enabled (in the Global Configuration settings), another link will be shown to enable self-registration for users. Help
Menu Module
This module displays a menu on the site (frontend). Â Menus can be displayed in a wide variety of ways by using the menu options and css menu styles. Help
Most Read Content
This Module shows a list of the currently published Articles which have the highest number of page views. Help
News Flash
Displays a set number of articles from a category based on date or random selection. Help
Subcategorías
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!. 
