WordPress/What is WordPress?

WordPress is a very popular free and open source (FOSS) blogging tool and a content management system (CMS) based on PHP and MySQL, which runs on a web hosting service.

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Over 16 million websites were using Wordpress in september 2012, expressed differently: almost 20% of the top 10 million websites were using this CMS in 2013. For more information see Wikipedia:Wordpress.