Joomla is a free open source online CMS (Content Management System) that allows customizing website design using Joomla templates. Joomla templates and CMS will provide you with a rich set of the features that will enrich your website greatly. These Joomla templates features include: RSS feeds, latest news sections, vote polls, internal site search, etc. You can install different features to Joomla templates since the features are only the php modules.