This bar chart displays the population of 20 countries in 2010, ordered along a vertical band scale with horizontal bars extending along a linear population scale. The visualization is rendered as an SVG using React and D3 v5, with data loaded from a CSV file via `d3.csv`. Axes are custom-built using `scaleBand` and `scaleLinear`, while tick labels format population values with the `d3.format` function, converting billions (G) to billions (B). Interactive tooltips appear on each bar via SVG `<title>` elements.