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 WordPress (WP, WordPress.org) is a free and open-source content management system (CMS) written in PHP[4] and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system, referred to within WordPress as Themes. WordPress was originally created as a blog-publishing system but has evolved to support other web content types including more traditional mailing lists and forums, media galleries, membership sites, learning management systems (LMS) and online stores. WordPress is used by more than 60 million websites,[5] including 39% of the top 10 million websites as of January 2021,[6][7][8] WordPress is one of the most popular content management system solutions in use.[9] WordPress has also been used for other application domains, such as pervasive display systems (PDS).[10]

WordPress was released on May 27, 2003, by its founders, American developer Matt Mullenweg[1] and English developer Mike Little,[11][12] as a fork of b2/catalog. The software is released under the GPLv2 (or later) license.[13]

To function, WordPress has to be installed on a web server, either part of an Internet hosting service like WordPress.com or a computer running the software package WordPress.org in order to serve as a network host in its own right.[14] A local computer may be used for single-user testing and learning purposes.

"WordPress is a factory that makes webpages"[15] is a core analogy designed to clarify the functions of WordPress: it stores content and enables a user to create and publish webpages, requiring nothing beyond a domain and a hosting service.

WordPress has a web template system using a template processor. Its architecture is a front controller, routing all requests for non-static URIs to a single PHP file which parses the URI and identifies the target page. This allows support for more human-readable permalinks.[16]

Themes:

WordPress users may install and switch among different themes. Themes allow users to change the look and functionality of a WordPress website without altering the core code or site content. Every WordPress website requires at least one theme to be present and every theme should be designed using WordPress standards with structured PHP, valid HTML (HyperText Markup Language), and Cascading Style Sheets (CSS). Themes may be directly installed using the WordPress "Appearance" administration tool in the dashboard, or theme folders may be copied directly into the themes directory, for example, via FTP.[17] The PHP, HTML and CSS found in themes can be directly modified to alter theme behavior, or a theme can be a "child" theme that inherits settings from another theme and selectively overrides features.[18] WordPress themes are generally classified into two categories: free and premium. Many free themes are listed in the WordPress theme directory (also known as the repository), and premium themes are available for purchase from marketplaces and individual WordPress developers. WordPress users may also create and develop their own custom themes. The free theme Underscores created by the WordPress developers has become a popular basis for new themes.