This bar chart displays the 2020 population estimates for thirty countries, using horizontal bars ordered by country name. The visualization relies on D3 version 5's `scaleBand` and `scaleLinear` to map categorical and quantitative data, with React components rendering SVG rectangles. Data is loaded from a remote CSV via D3's `csv` function, and population values are formatted using D3's `format` with SI prefixes, converting values from raw numbers to billions.