WordPress is a free and open-source content management system (CMS) that allows users to create and manage websites and blogs. It is based on PHP and MySQL and is one of the most popular CMS platforms in the world, powering over 40% of all websites on the internet. With its user-friendly interface, customizable themes and plugins, and strong community support, WordPress is a powerful tool for businesses, bloggers, and anyone looking to establish a web presence. It's a versatile platform that can be used for everything from simple personal blogs to complex e-commerce websites. Overall, WordPress is a powerful and flexible platform for building websites of all kinds.