This bar chart displays the top 10 most populous countries, with population values read from a CSV file and rendered as horizontal bars. The visualization uses D3.js v7’s `scaleLinear` and `scaleBand` for positioning, `axisLeft` and `axisBottom` for custom axes, and a tick formatter that converts large numbers into abbreviated units (e.g., "B" for billions). Axes are styled with custom CSS, and grid lines are drawn via tick sizing.