This chapter shows you how to add more features to your Joomla web site. To add a particular feature, you need to install the respective extension. Extensions are packages that can be downloaded from the Internet at no cost and are easily installed on your Joomla web site. Some examples of extensions are shopping carts, forums, social networking profiles, job boards, and estate listings. Extensions are like add-ons to your Joomla web site for features that are not provided in the default Joomla package.