This example shows a horizontal bar chart of the ten most populous countries in 2020, using a CSV file fetched from a GitHub gist. React manages the component state and renders SVG rectangles, while D3 utilities handle data loading with `d3.csv` and scales with `scaleBand` and `scaleLinear`. The chart positions each country along the y-axis and maps population values to bar widths on the x-axis, updating after the data loads asynchronously.