This bar chart displays the population of 20 countries in 2010, sorted along a horizontal axis against a categorical list of country names on the vertical axis. Built with React and D3 v5, it uses `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis, rendering SVG rectangles. Data is loaded as CSV from a GitHub repository, with population values formatted using D3’s `format('.2s')` to abbreviate large numbers. Hovering over each bar reveals its exact value via a native SVG `<title>` tooltip.