React is a JavaScript library for building user interfaces

Build encapsulated components that manage their own state, then compose them to make complex UIs.

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.

Most React apps will have their files “bundled” using tools like Webpack, Rollup or Browserify. Bundling is the process of following imported files and merging them into a single file: a “bundle”. This bundle can then be included on a webpage to load an entire app at once.

Client-side rendering allows developers to make their websites entirely rendered in the browser with JavaScript. Instead of having a different HTML page per route, a client-side rendered website creates each route dynamically directly in the browser.