This bar chart displays the populations of the ten most populous countries, using 2018 estimates from the United Nations World Population Prospects. It renders SVG rectangles scaled with `d3.scaleLinear` for the population axis and `d3.scaleBand` for country categories, with customized `d3.axisBottom` and `d3.axisLeft` ticks. Data is loaded from a CSV via `d3.csv`. The chart also includes a title and axis label, demonstrating manual axis and tick-format customization.