This example displays a horizontal bar chart of the top nine countries by 2020 population, with country names on the y-axis and population on the x-axis. The React app uses a custom `useData` hook to fetch CSV data via D3’s `csv` utility, then renders SVG with D3 scales (`scaleBand` and `scaleLinear`) and helper components for axes and marks. The `Marks` component creates `rect` elements for each bar, while the axis components generate tick lines and text labels.