A horizontal bar chart displays the top 10 most populous countries using population data from a CSV file. The chart customizes both axes: a linear x-axis formats population values in billions with a custom tick formatter, while a band y-axis lists country names without domain lines. Built with D3 v5, the visualization uses `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to render SVG rectangles, with hover effects changing bar colors to red.