This bar chart displays the populations of the top 10 most populous countries, using 2018 estimates from the data source. The visualization customizes both axes by removing domain lines, adding gridlines on the x-axis through `tickSize`, and formatting population values with `d3.format`. The code uses d3 v5 with `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft` to render SVG elements, with a title and axis label included.