ReactJS and React Native were created by Facebook to address issues with frequent system updates and simultaneous access to features. ReactJS is a JavaScript library for building user interfaces on the web, while React Native is a framework for building native mobile apps using React. The technologies share a common syntax but have key differences - ReactJS uses HTML/CSS and React Native uses native platform APIs. Both offer benefits like reusable components and one-way data binding, but also have limitations such as lack of documentation and debugging issues.