A horizontal bar chart displays the populations of the top ten countries as of 2020, loaded from a CSV file. The chart uses React state to manage the data and renders SVG rectangles whose widths are scaled by population via `scaleLinear` and `scaleBand`. D3’s `csv` utility parses the data, while `max` determines the domain. The bars show a clear ranking, with the longest bar representing the most populous country, and the chart updates once the data loads.