This horizontal bar chart displays the 2020 populations of the top 30 countries from a GitHub-hosted CSV dataset. React components render SVG rectangles whose widths are scaled by d3.scaleLinear, while d3.scaleBand positions each country on the y-axis. The code uses d3.csv for data loading, d3.format for tick labels, and the AxisBottom and AxisLeft components to draw the chart’s axes.