This bar chart displays the 2020 population estimates for 30 countries, ordered vertically by country name with horizontal bars representing population values. Population data is loaded from a GitHub-hosted CSV file and formatted using D3's SI format to display values in billions. The visualization is built with React components, using D3 v5 scales (`scaleBand` and `scaleLinear`) to map data, while SVG rectangles with native `<title>` tooltips render the bars. Axes are generated manually through custom React components rather than D3 axis generators, with styling applied via CSS classes.