This visualization displays a horizontal bar chart of the top 20 countries by population in 2010, using data loaded from a CSV file via d3.csv. The React app renders SVG bars with d3.scaleBand for the y-axis and d3.scaleLinear for the x-axis, formatting tick labels with d3.format. Axes are custom components, and each bar includes a native SVG tooltip showing the population value using the same formatted scale.