This bar chart displays the top 10 most populous countries, sorted by population, with customized axes for readability. The horizontal axis uses a linear scale with a tick format that abbreviates large numbers (e.g., converting billions with the `format` API), while the vertical axis uses a band scale for country names. The chart is rendered in SVG using d3.v6, loading data from a CSV file, with axes styled via `axisBottom` and `axisLeft`, and grid lines drawn through negative tick sizes.