A bar chart displays the ten most populous countries, with the x-axis showing population and the y-axis listing country names. The example demonstrates how to customize D3 axes by removing default domain lines and tick marks, adding custom tick formatting, and labeling the axes. Using d3.csv, d3.scaleLinear, d3.scaleBand, and d3.axisBottom, it renders SVG bars and applies custom styling to ticks and labels.