A smiley face rendered as SVG is built from React components for the background circle, eyes, and mouth. The mouth is generated using the d3 `arc` function to create a path. The example demonstrates a modular approach to composing SVG elements, with React managing the component hierarchy and d3 providing geometry. The code imports React and uses `ReactDOM.render` to mount the application, while the page includes a video embed. The data loading aspect is not implemented, as the app renders a static face.