Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS.
Joomla is written in PHP, uses object-oriented programming (OOP) techniques and software design patterns. It stores data in a MySQL, MS SQL or PostgreSQL database.
It is estimated to be the second most used content management system on the Internet after WordPress.