A horizontal bar chart displays the populations of 30 countries in 2020, sorted by country name with colored green bars. Built with React and D3 v5, it uses `scaleBand` for the y-axis and `scaleLinear` for the x-axis, with SVG rectangles rendered via the `Marks` component. Population values are loaded from a remote CSV file using `d3.csv`, converted to numbers, and formatted with `d3.format` to abbreviate large numbers (e.g., "1.5B"). Axis labels and ticks are generated by custom `AxisBottom` and `AxisLeft` components, and hovering reveals exact values via SVG `<title>` tooltips.