A horizontal bar chart displays the population of 20 countries in 2010, sorted by country name. The visualization uses D3’s `scaleBand` and `scaleLinear` to map countries and populations to SVG rectangles, with React managing the component structure. Data is loaded asynchronously via `d3.csv` from a GitHub-hosted CSV file, and population values are formatted with `d3.format` to abbreviate large numbers (e.g., “1.2B”). Blue axis lines and green bars are styled with CSS.