WordPress is a free and open-source content management system that enables users to create and manage websites without needing programming knowledge. It can be used to build a variety of sites, such as blogs, e-commerce stores, and business websites, with the primary distinction between WordPress.org (self-hosted) and WordPress.com (paid service). Developed by Matt Mullenweg and Mike Little, WordPress has become the backbone of over 43.3% of all websites on the internet.