WordPress is an open-source content management system (CMS) that enables users to create, manage, and publish content on the web. Initially released in 2003 as a blogging platform, WordPress has evolved into a versatile CMS used for a wide range of websites, including blogs, business sites, e-commerce stores, portfolios, and more. Its ease of use, flexibility, and robust feature set have made it one of the most popular website-building tools globally.