This horizontal bar chart displays the 2020 populations of 30 countries, ordered from largest at the top to smallest at the bottom. Each bar’s length represents population in billions, with a labeled x-axis and country names on the y-axis. The visualization loads CSV data via d3.csv, scales it using d3.scaleBand and d3.scaleLinear, and renders SVG rectangles through React components. D3’s format function abbreviates large numbers, while the code also defines reusable AxisBottom, AxisLeft, and Marks components.