This bar chart displays the top 10 most populous countries in 2020 based on United Nations World Population Prospects data. Using React with SVG rendering, it employs d3.scaleBand for the categorical y-axis and d3.scaleLinear for the x-axis population values, with d3.format to convert raw numbers into abbreviated tick labels. The visualization includes left and bottom axes, horizontal bars with native SVG tooltips showing population magnitude, and a clear axis label for the quantitative dimension.