This bar chart displays the top 10 most populous countries using population data from a CSV file. The visualization customizes both axes: the y-axis removes domain lines and ticks for a cleaner look, while the x-axis formats population values (e.g., converting "G" to "B" for billions) and extends tick lines across the chart. Built with D3 v7, it uses `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom`, rendering as SVG. The x-axis label and title are added as text elements, with bars styled in steelblue via external CSS.