This bar chart displays the populations of the top 10 countries for 2020, with country names on the y-axis and population values on the x-axis. Built with React and D3 v7, it uses `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis, rendering bars as SVG rectangles. The data is loaded via `d3.csv` from a GitHub gist, and formatted tick labels use `d3.format` to abbreviate large numbers. Tooltips show exact values when hovering over each bar.