WordPress

WordPress is a free and open-source blogging tool and a content management system (CMS) based on PHP and MySQL.[5] Features include a plugin architecture and a template system. WordPress was used by more than 23.3% of the top 10 million websites as of January 2015.[6] WordPress is the most popular blogging system in use on the Web,[7] at more than 60 million websites.[8]

It was first released on May 27, 2003, by its founders, Matt Mullenweg[1] and Mike Little,[9] as a fork of b2/cafelog. The license under which WordPress software is released is the GPLv2 (or later) from the Free Software Foundation.[10]