This bar chart displays the population of the top 10 most populous countries, with data from the 2018 United Nations World Population Prospects. It uses d3.csv to load the data, converting population values to thousands, then renders horizontal bars with d3.scaleLinear and d3.scaleBand. The chart customizes D3 axes by removing the y-axis domain and tick lines, and formats x-axis ticks using d3.format to abbreviate large numbers as billions.