This bar chart displays the top 10 most populous countries in 2020, using horizontal bars sorted by population. The visualization is built with React and D3 v5, employing `d3.scaleBand` for the categorical y-axis and `d3.scaleLinear` for the numeric x-axis. SVG `<rect>` elements represent each country, with axes rendered as custom React components. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv` and formatted with `d3.format`.