In May 2013, Facebook released the React JavaScript library, enabling developers to build efficient, component-based UIs with features like stateful components, virtual DOM, one-way data binding, lifecycle methods, and JSX. React quickly became popular for creating smooth, data-driven web applications. In 2015, Facebook expanded React to mobile app development with React Native, allowing code reuse across iOS, Android, and web platforms. This cross-platform capability has driven high demand for React Native developers, with major companies like Facebook, Instagram, Bloomberg, Pinterest, and others adopting the technology.