React is a free and open-source front-end JavaScript library for building user interfaces based on UI components. It is maintained by Meta (formerly Facebook) and a community of individual developers and companies. React can be used as a base in the development of single-page, mobile, or server-rendered applications with frameworks like Next.js. However, React is only concerned with state management and rendering that state to the DOM, so creating React applications usually requires the use of additional libraries for routing, as well as certain client-side functionality.
React has to display only the necessary changes for the user instead of reloading page or content from scratch.
React provides a developer with all necessary tools to make the components render faster without complex effort.
Big community and standard components with comprehensible behaviour give us control over the development process.
Component reuse over the app rumps up the development speed of complex interfaces.