This bar chart ranks the 30 most populous countries by their 2020 population estimates, with horizontal bars sorted along a categorical y-axis and a linear x-axis. The visualization uses React to render SVG elements, with D3 v5 providing the `scaleBand` and `scaleLinear` scales, axis components, and CSV data loading. Population values are formatted in billions using D3’s `format` function, and each bar includes a tooltip displaying the formatted value. Data comes from a remote CSV file.