This example shows a minimal React application that renders the text “Hello React!” inside a full-screen viewport. It demonstrates how to mount a React component into the DOM using `ReactDOM.render` from `react-dom`, with the component defined as a functional component in `index.js`. The page loads React and ReactDOM from CDN scripts in `index.html` and uses a bundled `bundle.js` for the application code. No data visualization is present; the focus is purely on the React starter setup.