This bar chart displays the populations of the top 10 most populous countries in 2021, ranked from China to Mexico. The visualization uses a horizontal bar layout, with population values plotted on a linear x-axis and country names on a banded y-axis. The data is loaded from a CSV file using D3’s `csv` function and rendered as SVG rectangles. The code applies `scaleLinear` and `scaleBand` for scaling, and customizes axes with `axisBottom`, `axisLeft`, and tick formatting that converts values to billions.