A horizontal bar chart displays the ten most populous countries based on United Nations 2020 estimates, with population values plotted along a linear x-axis and country names along a band y-axis. The React component loads CSV data via `d3.csv`, then renders SVG rectangles and axis tick labels using `scaleLinear`, `scaleBand`, and `max` from D3 v6. The chart applies explicit margins to position axes, which are manually constructed from `xScale.ticks()` and `yScale.domain()` rather than using D3's axis generators.