React is a renowned JavaScript library developed and maintained by Facebook for building user interfaces or UI components. Founded by Mark Zuckerberg, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes in 2004, Facebook, the tech giant, quickly ascended to global prominence with its innovative social networking platform. Within Facebook’s ecosystem, React has been heavily utilized in powering up the interfaces of many of its products, including the main Facebook website. Its declarative paradigm enables efficient updates and rendering, making it especially beneficial for single-page applications. React’s component-based architecture also ensures easier codebase maintenance and scalability.