This example displays the ten most populous countries as horizontal bars, with country names on the y-axis and population totals on the x-axis. The visualization loads data from a United Nations World Population Prospects 2019 CSV file, which is parsed using `d3.csv` and sliced to the top ten entries. The chart is built with React components and rendered as SVG, using `d3.scaleBand` for the categorical y-axis, `d3.scaleLinear` for the numeric x-axis, and `d3.format` to abbreviate large population values. Hovering over a bar reveals its precise population via a native SVG `<title>` tooltip.