it is a free and open-source content management system (CMS) based on PHP and MySQL. it is installed on a web server, which either is part of an Internet hosting service or is a network host itself; the first case may be on a service like WordPress.com, for example, and the second case is a computer running the software package WordPress.org. An example of the second case is a local computer configured to act as its own web server hosting it for single-user testing or learning purposes. Features include a plugin architecture and a template system. it was used by more than 26.4% of the top 10 million websites as of April 2016