Category Introduction (Please choose an article under the orange bar)

Extensions plug into Joomla! easily and quickly from the Administrator Panel.

They can be :

• Components - These are mini-applications such as a shopping cart, a forum, A Search Engine Friendly Links creator.
• Modules - these usually provide a specific function, and have the ability to be placed anywhere around your website
• Mambots - "Bots" - These provide small functions, often in the background.  In the Joomla 1.5.x series, the name has been changed to "plugins"
  

An extension can be any of the above types, or could include one or more of these types in order to carry out its function

As of June 2008, there are 3200 different extensions, and many of them are GPL (Free)

Here's where you can find them : http://extensions.joomla.org