This example displays a horizontal bar chart of the top 10 most populous countries, using 2018 population estimates from the United Nations World Population Prospects 2017. It highlights customization of D3 axes, including a formatted x-axis that converts large numbers to abbreviated units like “B” for billions. The chart is rendered in SVG using d3.scaleLinear, d3.scaleBand, d3.axisLeft, and d3.axisBottom, with data loaded via d3.csv. The code also removes default axis domains and tick lines for a cleaner appearance.