This example displays a horizontal bar chart of the top ten countries by 2020 population, based on UN population data loaded as CSV via `d3.csv`. React manages the component state with `useState` and `useEffect` to fetch the data, while D3 v7 utilities `scaleBand` and `scaleLinear` map country names and population values to SVG rectangles. Rendering occurs through React’s virtual DOM into an SVG container, with a loading message shown before the data arrives.