WordPress is primarily written in the programming languages PHP (Hypertext Preprocessor) and JavaScript. PHP is a server-side scripting language that is widely used for web development. WordPress uses PHP for its core functionalities, such as handling database interactions, processing server-side requests, and generating dynamic web pages.

JavaScript, on the other hand, is a client-side scripting language primarily used for enhancing user interactions and providing dynamic functionality on the web. WordPress utilizes JavaScript extensively in its administration panel (backend) and for various frontend features, including themes and plugins.

In addition to PHP and JavaScript, WordPress also incorporates HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) for structuring and styling web pages, respectively. These languages work together to create the overall functionality and appearance of WordPress websites.