This example shows a horizontal bar chart displaying the top 10 countries by 2020 population, using React for component structure and D3 for scales. It renders SVG rectangles with widths proportional to population values, using `scaleBand` for the y-axis and `scaleLinear` for the x-axis. Data comes from a CSV file loaded via `d3.csv`, and React’s `useState` and `useEffect` manage the asynchronous data fetching. The visualization appears once data is loaded, otherwise showing a loading message.