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react.dev/docs/refactor/01-motivation.md

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Motivation / Why React?

React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the V in MVC.

We built React to solve one problem: building large applications with data that changes over time. To do this, React has two main ideas:

Stay simple and declarative

React apps are easy to write. Simply express how the UI should look at any given point in time, and React will manage all UI updates for you when your underlying data changes.

It's just like writing a server-rendered web app: when the data changes, React conceptually hits the refresh button, except React is very fast and maintains the state of your UI. Because of this, React's API is very small and easy to understand.

Build composable components

React is all about building reusable components. In fact, with React the only thing you do is build components. Since they're so encapsulated, components make code reuse, testing, and separation of concerns easy.

Give it five minutes

React challenges a lot of conventional wisdom, and at first glance some of the ideas may seem crazy. We ask that you give it five minutes while reading about React; engineers and designers have built thousands of components both inside and outside of Facebook and Instagram, and we hope you'll find it useful!