A horizontally oriented bar chart ranks ten countries by 2020 population, using a teal fill and a clean Roboto typeface. The React application, built with D3 v5, loads CSV data via `d3.csv` and renders SVG elements through scaleBand and scaleLinear for the axes. Styled ticks and a formatted axis label display values in billions, while each bar includes a native SVG tooltip. The code is refactored into separate AxisBottom, AxisLeft, and Marks components for clarity.