WordPress is a free and open source content management system used to create, design, and manage websites without needing to write code from scratch. It allows users to build everything from simple blogs and portfolio sites to complex online stores and business portals. With thousands of customizable themes and plugins, anyone can easily add features like contact forms, payment gateways, and search engine optimization tools. Because of its flexiblity and ease of use, WordPress powers a large portion of all websites across the internet today.