React

React is a popular JavaScript library used for building user interfaces, particularly for web applications. It allows developers to create reusable components, which are like building blocks for the interface, making it easier to manage and update the application. React is efficient in updating only the parts of the user interface that change, rather than reloading the entire page. This results in smoother and faster experiences for users. It was developed by Facebook and is widely used in the tech industry due to its flexibility and performance in creating interactive applications.