WordPress is an open source blog tool and publishing platform powered by PHP and MySQL. It’s often customized into a Content Management System (CMS). It has many features including a plug-in architecture and a template system. WordPress is used by over 14% of Alexa Internet’s “top 1 million” websites.
It was first released on May 27, 2003, by Matt Mullenweg as a fork of b2/cafelog. As of February 2011, version 3.0 had been downloaded over 32.5 million times.