This example demonstrates minimal setup for a React application that includes D3.js. The `index.html` loads the d3.v5 library from a CDN, and `index.js` defines a React component that renders a simple paragraph saying “lets”. The code uses `ReactDOM.render` to mount the component into the `#root` div, but does not yet use any D3 functionality. It serves as a starting point for integrating D3 visualizations into a React component structure, with the `bundle.js` file referenced in the HTML indicating a build process.