A stylized horizontal bar chart ranks the ten most populous countries using UN World Population Prospects 2019 data. The code builds a React component with SVG rendering, using d3.scaleBand for the categorical y-axis and d3.scaleLinear for the numeric x-axis. Axes are drawn via custom AxisBottom and AxisLeft components, while Marks creates rects with native tooltips. d3.format converts population values into compact notation like “1.4B” for tick labels.