WooCommerce is a popular open-source e-commerce plugin for WordPress websites. It provides a comprehensive set of features and tools to help businesses create and manage their online stores. With WooCommerce, users can easily set up product listings, manage inventory, process payments, and handle shipping. It also offers a wide range of extensions and themes to customize the appearance and functionality of the online store. WooCommerce is known for its user-friendly interface, flexibility, and scalability, making it a preferred choice for businesses of all sizes looking to establish a successful online presence.