This example displays the 20 most populous countries in 2020 as a horizontal bar chart, sorted by population size. The visualization uses React to render SVG elements, with D3’s `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis. Custom axis components generate ticks and labels, while each bar includes a tooltip via the SVG `<title>` element. Data comes from the United Nations World Population Prospects 2019, loaded as CSV and formatted with D3’s `format` to abbreviate large numbers (e.g., billions).