This bar chart displays the populations of the top ten most populous countries using 2018 estimates from the United Nations World Population Prospects. It demonstrates customization of D3 axes, removing their default domains and styling tick text and lines. Built with d3.v5, it uses `d3.csv` to load data, `d3.scaleLinear` and `d3.scaleBand` for scales, and `d3.axisLeft` and `d3.axisBottom` for axes, with a tick format that converts millions (G) to billions (B). Bars are rendered as SVG rectangles.