Joomla is an open source content management system that is used by many websites and applications around the world. It is easy to install, manage, and reliable. Joomla can be used to build simple websites, community portals, blogs, e-commerce sites, and more. Some examples of companies and organizations using Joomla include Jetstar, Hannover Fairs Australia, The Chaser's War on Everything TV show, iTWire news site, the United Nations, Eurovision Song Contest, 64 Magazine, 11°south magazine, Mitsubishi Venezuela, and Porsche Brazil.