A horizontal bar chart displays the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset. D3’s `scaleBand`, `scaleLinear`, and `max` are used to compute positions and widths, while React’s `useState` and `useEffect` manage asynchronous CSV loading. The chart renders SVG rect elements for bars and manually constructs axes using `xScale.ticks()` for tick values and SVG line/text elements, with margins shifting the plot via a `<g>` transform.