This example shows a horizontal bar chart of the top 30 countries by 2020 population, with blue axis ticks, green bars, and formatted labels (using SI units where G becomes B). The React application uses D3 v5 utilities d3.scaleBand, d3.scaleLinear, and d3.csv to fetch and process data, rendering SVG marks via custom components. Tooltips reveal precise population values on hover, while the axes and labels use styling from the Poppins font.