WordPress is one of the most popular content management system solutions in use. It is a free and open-source content management system (CMS) written in PHP and paired with a MySQL or MariaDB database. It was originally created as a blog-publishing system but has evolved to support other types of web content including mailing lists, forums, media galleries, membership sites, learning management systems (LMS), and online stores. As of April 2019, WordPress is used by more than 60 million websites including 33.