This example shows a horizontal bar chart of the top 10 most populous countries, with a customized axis that abbreviates large population values (e.g., converting billions to "B") using d3.format. The chart reads from a CSV file and renders as SVG rectangles with steelblue fill. It uses d3.scaleBand and d3.scaleLinear for positioning, along with d3.axisLeft and d3.axisBottom for axes, while stripping default tick lines and domains via selection methods.