This interactive bar chart visualizes the top 10 most populous countries using United Nations World Population Prospects 2019 data. React renders the SVG visualization, while D3 v5's `scaleBand` and `scaleLinear` position the rectangles and axes. The code uses `csv` to load the dataset, `format` for tick labels, and includes hover tooltips via SVG `<title>` elements. The Poppins font and custom axis styling give the chart its distinctive clean, modern appearance.