React World is a vibrant community centered around the React JavaScript library, which is used for building user interfaces, particularly for web applications. It provides developers with tools to create interactive and dynamic web pages efficiently. The library is maintained by Facebook and has gained immense popularity due to its component-based architecture. In React World, developers share knowledge, resources, and best practices through various platforms, including forums, blogs, and conferences. The community also supports numerous libraries and tools that enhance the React ecosystem, such as Redux for state management and React Router for navigation, making it easier to build complex applications.