A bar chart displays the populations of the top ten most populous countries, using 2018 estimates from the United Nations World Population Prospects. The visualization customizes both axes: the y-axis removes its domain line and tick lines, while the x-axis uses a custom tick format that converts values from millions to billions. Built with D3 v7 and d3-scale.v3, the chart uses `scaleLinear` and `scaleBand` for scaling, `axisLeft` and `axisBottom` for axes, and renders as SVG with steelblue bars.