ReactJs — Introduction to React.js

React.js is a popular JavaScript library for building user interfaces, especially single-page applications (SPAs). It uses a component-based architecture, where UI elements are created as reusable, independent pieces. React makes use of a virtual DOM for efficient rendering and updates, improving performance.

import React from 'react';

function App() {
  return <h1>Hello, World!</h1>;
}

export default App;