This bar chart visualizes the top 20 countries by population for the year 2010, using a horizontal layout with countries on the y-axis and population on the x-axis. It uses React with D3 v5 scales (scaleBand, scaleLinear) to position SVG rectangles, with axis components rendering ticks and labels. Data loads from a CSV via d3.csv, and tooltips display formatted population values using d3.format.