React is a popular open-source JavaScript library used for building user interfaces. It was developed by Facebook and released in 2013. React allows developers to create reusable UI components and manage the state of these components efficiently.
React follows a declarative approach to programming, which means that developers specify what they want the UI to look like, and React takes care of the rest. React also uses a virtual DOM (Document Object Model), which allows for faster updates and rendering of the UI.
React is widely used for building single-page applications, mobile applications, and desktop applications. It has a large and active community of developers, which has contributed to the development of many third-party libraries and tools that enhance the development experience.