RSS (which stands for, among other things, Really Simple Syndication) that allows you to syndicate your site content. It defines an easy way to share and view headlines and content through newsfeeds. You can find RSS feeds in hundreds of thousands of places on the Internet which allow you to stream their articles into RSS readers - or your Joomla site.
The Feed Display module allows you to display other sites’ RSS feeds on your site, which is a great way to keep your content from being static.
One of the elements of model-view-controller (MVC) design pattern used for Joomla core components. The controller executes tasks that are being requested by the client or the system. The base API class we use for a controller is called JController.
An extension is a software package that extends your Joomla! installation in some way. A small selection of extensions is included with the default Joomla! installation but many more are available from the Joomla! Extensions Directory.
The term extension is generic and the following specific extension types are available (listed alphabetically):
Component (since ) – adds custom functions to your site that can be selected from menus
Language (since ) – defines an additional language for your site
Library (since ) – provides functions to be used by other extensions
Module (since ) – shows nonessential data in a side box, possibly on multiple pages
Package (since ) – bundles related extensions
Plugin (since ) – modifies content in articles or provides functions to extend other extensions
Template (since ) – define the look, feel, and navigation capabilities of your site
For an overview of the most important extension types and the functionality they provide, see Extension types (general definitions)
Reference: http://docs.joomla.org/Glossary
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