React makes it painless to create interactive UIs.
Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes.
Declarative views make your code more predictable and easier to debug.
Build encapsulated components that manage their own state, then compose them to make complex UIs.
React doesn't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code.
React can also render on the server using Node and power mobile apps using React Native.
Open source is a philosophy that promotes the free access and distribution of an end product, usually software or a program.
A progressive web app (PWA) is a website that looks and behaves as if it is a mobile app.
An SPA is a Web app that is presented to the user through a single HTML page to be more responsive and to more closely replicate a desktop application or a native app.