This visualization displays a horizontal bar chart ranking the populations of 20 countries for 2010, using green bars labeled along the left axis with a formatted population scale on the bottom. The React application loads data from a CSV file via d3.csv, then uses d3.scaleBand and d3.scaleLinear to position bars and axes, rendered as SVG rectangles. Tooltips, provided through native SVG `<title>` elements, show the exact population in billions using d3.format.