This example shows a horizontal bar chart of the top 10 countries by population, with a customized axis that formats large population values into abbreviated units like "B" for billions. The chart uses d3.scaleLinear and d3.scaleBand for positioning, while d3.axisLeft and d3.axisBottom render the axes with custom tick formatting via d3.format. The implementation loads data from a CSV file, removes default axis domain lines, and adds labels for the population axis and chart title.