A horizontal bar chart displays the 2020 populations of 30 countries, sourced from a CSV file via the D3 `csv` function. The visualization uses React to render SVG elements, with D3's `scaleBand` and `scaleLinear` mapping country names and population values to positions. Tooltips reveal exact population figures, and axes include custom tick formatting that abbreviates large numbers. The chart applies a green fill to marks and a blue stroke to axis lines.