This stylized bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. The visualization uses React components with D3 v5 scales (`scaleBand` and `scaleLinear`) for positioning, and renders horizontal bars as SVG `<rect>` elements. Population values are formatted using D3’s `format` function, converting values like billions into a compact "B" suffix. The chart loads CSV data via `d3.csv` and includes custom axes and tooltips showing exact population figures on hover.