This example shows a horizontal bar chart ranking the ten most populous countries using 2020 data from the United Nations World Population Prospects 2019. React manages the component state and lifecycle, fetching the CSV with d3.csv and storing the parsed data via useState. D3 scales, including scaleBand and scaleLinear, position the bars and axes, while the SVG rendering manually draws tick marks, labels, and rectangles rather than using d3.axis.