React (sometimes styled React.js or ReactJS) is an open-source JavaScript library for building user interfaces.
It is maintained by Facebook, Instagram and a community of individual developers and corporations. According to JavaScript analytics service Libscore, React is currently being used on the websites of Netflix, Imgur, Buffer, Bleacher Report, Feedly, Airbnb, SeatGeek, HelloSign, Walmart, and others.
React allows developers to create large web applications that use data which can change over time, without reloading the page. Its main goal is to be fast, simple and scalable. React processes only user interfaces in applications. This corresponds to View in the Model-View-Controller (MVC) template, and can be used in combination with other JavaScript libraries or frameworks in MVC, such as AngularJS.