Joomla is known as one of the most popular open source content management systems (CMS) in business. WordPress, which is another popular CSM, was in the business of providing FREE but restricted hosting for WordPress based sites under WORDPRESS.COM domain. This WordPress service has been known for higher positions in Google page rankings and higher visitor turnarounds.
Recently (actually on January 20, 2015) Joomla has started providing the same service in lesser-restricted way. By providing an option to have a free-hosted website for unlimited time, Joomla aims to become even more popular and substantially increase its user base.