React JS online training refers to a structured educational program delivered over the internet that focuses on teaching React JS, a popular JavaScript library for building user interfaces. In this training, participants typically learn the fundamentals of React JS, including concepts such as component-based architecture, state management, JSX syntax, and handling events. The training may cover advanced topics like React Hooks, context API, routing with React Router, and integrating React with other libraries and frameworks. The online format allows participants to access the training materials, lectures, and exercises remotely, making it convenient for individuals to learn at their own pace from anywhere with an internet connection.