This visualization displays the populations of 20 countries for the year 2010 using a horizontal bar chart, with each bar's length proportional to its population. The data is loaded from a CSV file using D3's `csv` function and rendered as SVG rectangles via React's declarative syntax. The chart employs D3's `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis. Formatting converts large numbers to abbreviated forms like "B" for billions, while tooltips show the exact values. Axes and bars are styled through CSS classes defined in the embedded stylesheet.