This example shows a horizontal bar chart of the ten most populous countries in 2020, using data from the UN Population 2019 dataset loaded via `d3.csv`. It displays country names on the y-axis using `scaleBand` and population values on the x-axis with `scaleLinear`, rendering the bars as SVG `<rect>` elements. The React component manages data loading with `useState` and `useEffect`, while D3 handles the scales and CSV parsing.