This bar chart displays the top 10 most populous countries for the year 2020, with horizontal bars mapped to population values and country names on the y-axis. It is built with React and D3 v6, using `scaleBand` and `scaleLinear` for positioning, while SVG elements render the axes, bars, and labels. The data comes from a CSV of United Nations World Population Prospects 2019, loaded via D3’s `csv` function, and the chart includes formatted population labels plus a zero line for reference.