This bar chart displays the top 10 most populous countries using United Nations World Population Prospects 2019 data, loaded via d3.csv. It uses React with d3.scaleBand for the y-axis and d3.scaleLinear for the x-axis, rendered as SVG rect elements. Axes are drawn with custom React components (AxisBottom and AxisLeft), with tick labels formatted using d3.format to convert values to billions.