A horizontal bar chart displays the population of the ten most populous countries, with each bar's length proportional to the population value. The chart uses custom axes: the y-axis removes domain and tick lines for a cleaner look, while the x-axis formats tick labels using D3's `format` function to abbreviate numbers (e.g., "1.4B"). The code employs `d3.scaleLinear`, `d3.scaleBand`, `d3.axisBottom`, and `d3.axisLeft` to render the SVG visualization from a CSV data source.