This example shows a horizontal bar chart of the top ten most populous countries in 2020, using UN population data loaded from a CSV file. React state manages the fetched data, while D3’s `scaleBand` and `scaleLinear` map country names and population values to SVG rectangles. The bars render from left to right, with no axes or labels. The code uses `d3.csv` for data loading and React functional components with the `useState` and `useEffect` hooks to trigger and store the asynchronous data fetch.