Joomla is free open-source content management software (CMS) script for creating websites online. It is built with PHP (web programming language) and uses database system like MySQL for storing settings and data. It have large community of users, testers and developers. Standard features included are: content management – text/multimedia, caching, RSS feeds, internationalization (many languages available), polls, blogs and many others. Supports extension system where developers can contribute and add new features to the standard Joomla distribution version. There are over 4000 plugins available in the official plugin directory. There are many modules categories including: galleries, e-commerce, news, ads, communication, hosting, multimedia and others. Check the plugin directory here. Template system is also supported where webmaster can easily switch templates and change the layout of the entire site. Many free professional templates are available for Joomla. Together with Drupal they are the most popular content management systems, because you can create almost any type of website with them whether it would be news site, personal website/blog, complex corporate website, social site or other. Specific web hosting for Joomla is not required because the requirements are web server with PHP and MySQL installed, and if you need SEO urls the web server (Apache httpd is supported) .htaccess have to be enabled. Today many (almost all) hosts have the LAMP (Linux Apache MySQL PHP) stack setup on their servers so to run Joomla it would not be a problem. Some hosts allow custom PHP.ini so you can further customize specific PHP settings for some modules.