A horizontal bar chart displays the top 10 most populous countries, with inhabitants counted in thousands and formatted as abbreviated values like "1.44B". The chart uses d3.scaleLinear for the x-axis, d3.scaleBand for country categories, and d3.axisBottom with custom tick formatting via d3.format. It renders as SVG, with grid lines from tickSize, and removes default axis domains for a cleaner look. Data comes from a CSV file loaded using d3.csv.