A bar chart displays country populations from a CSV file, with five nations ranked by population across a horizontal layout. Using D3 v5, the code loads data with `csv`, maps values through `scaleLinear` and `scaleBand`, and renders SVG rectangles with dimensions scaled to population counts. The chart applies margins and a group transformation to position bars, while styles are defined in an external CSS file. The visualization presents a straightforward comparison of population sizes across the listed countries.