This example displays a horizontal bar chart of the top 10 countries by 2020 population, drawn as SVG rectangles. The visualization loads CSV data from a remote URL using D3’s `csv` utility, then React’s `useEffect` and `useState` manage the asynchronous data fetch and render the chart. D3’s `scaleBand` and `scaleLinear` map country names and population values to pixel coordinates, while React maps each data row to a `<rect>` element. The chart uses a minimal, unstyled SVG output with a large “Loading…” text before data arrives.