What is React?

What is React?

React is a JavaScript library for building user interfaces, especially interactive websites and web applications.

Think of React as a way to build a webpage from small, reusable pieces called components. For example, a website might have separate components for a navbar, search box, product card, and button.

function Welcome() {
  return <h1>Hello!</h1>;
}

Here, Welcome is a React component that displays Hello!.

React is popular because it provides reusable components, automatically updates the UI when application data changes, and works well for both small interactive features and large web applications.

React was originally created at Facebook (now Meta) and is open source.

If you're learning web development, a good order is HTML → CSS → JavaScript → React.