This chart displays the top 20 countries by their 2010 population as a horizontal bar chart, built with React and rendered as SVG. It uses d3’s `scaleBand` for the y-axis (country names) and `scaleLinear` for the x-axis (population), with the data loaded via `d3.csv` from a GitHub-hosted CSV file. The bars are colored green, and hovering over a bar reveals its exact population via an SVG `<title>` tooltip, with tick labels formatted using d3’s `format('.2s')` to abbreviate large numbers (e.g., "1.5B").