A horizontal bar chart displays the populations of 20 countries in 2010, sorted alphabetically by country name. The bars are rendered as SVG rectangles using React components, with D3 v5's `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis. Population values are loaded from a CSV file via `d3.csv`, formatted with `d3.format` to abbreviate large numbers (e.g., "1.2B"), and each bar includes a tooltip showing the exact value.