A horizontal bar chart displays population estimates for 25 countries in 2020, ranked from most to least populous. The chart reads from a CSV file and uses D3's `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to construct the visualization. Custom tick formatting converts large numbers into abbreviated text, replacing "G" with "B" for billions. The SVG output includes a title, axis labels, and styled bars with a steelblue fill.