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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. Written in PHP, Joomla uses object-oriented programming (OOP) techniques and software design patterns, stores data in a MySQL, MS SQL or PostgreSQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, search, and support for language internationalization.
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if not there is no way to upgrade them