This bar chart displays the population estimates for the top 30 countries in 2020, sorted along a horizontal axis with country names on the vertical axis. The visualization uses D3 v7’s scaleLinear and scaleBand to map population values to bar widths and categories to vertical positions, rendered as SVG rectangles. Data comes from a CSV file loaded via d3.csv, with axis labels formatted using d3.format to abbreviate large numbers like millions and billions.