A bar chart displays the population of the top ten most populous countries using data from the 2018 UN World Population estimate, with values converted from thousands to absolute numbers. The visualization uses D3 v5 to create scales, axes, and SVG rectangles, featuring a custom axis label and tick formatting that abbreviates large numbers (e.g., "G" replaced with "B"). The code relies on `scaleLinear`, `scaleBand`, `axisLeft`, `axisBottom`, and `format` to render the chart.