This horizontal bar chart displays the populations of the top 10 most populous countries from the 2018 United Nations World Population Prospects dataset. The visualization uses d3.scaleLinear, d3.scaleBand, d3.axisLeft, and d3.axisBottom to render the SVG, with customized axis ticks and labels, including a formatted y-axis that abbreviates numbers using the d3.format function to show values in billions.