This example demonstrates a horizontal bar chart of the top 10 most populous countries in 2020, using D3 scales to map population counts to bar widths and country names to vertical positions. The chart applies the margin convention, translating the SVG group by a fixed margin so the bars fit within the inner chart area. React state manages the fetched CSV data, loaded asynchronously via `d3.csv`, while `d3.scaleBand` and `d3.scaleLinear` handle the scales, and SVG `<rect>` elements render each bar.