This bar chart visualizes the top 10 most populous countries using 2018 estimates from the United Nations World Population Prospects. It shows population values on a horizontal axis with country names on a vertical axis, using D3’s `scaleLinear` and `scaleBand`. The example demonstrates axis customization, including a custom tick format that abbreviates numbers and converts G to B, and removes default axis lines and ticks. It builds on a previous bar chart example, rendering in SVG with D3 v5.