Both React.js and React Native are popular technologies for building web and mobile applications. However, the difference between these technologies is more than meets the eye. Thus, React.js is an open-source JavaScript library that supports both front-end and back-end sides, but its primary focus is on building user interfaces. At the same time, React Native is a cross-platform mobile framework created by Facebook for developing mobile applications that show smooth and seamless performance on Android, iOS, and Windows platforms.