WordPress is a free and open-source content management system based on PHP and MySQL. To function, WordPress has to be installed on a web server, which would either be part of an Internet hosting service or a network host in its own right. An example of the first scenario may be a service like WordPress.com, for example, and the second case could be a computer running the software package WordPress.org. A local computer may be used for single-user testing and learning purposes. Features include a plugin architecture and a template system. WordPress was used by more than 27.5% of the top 10 million websites. WordPress is reportedly the most popular website management or blogging system in use on the Web, supporting more than 60 million websites. WordPress has also been used for other application domains such as pervasive display systems.