This example shows a horizontal bar chart of the top 10 countries by 2020 population, rendered as SVG using React components. It demonstrates how to decompose a visualization into reusable pieces: the bottom axis, left axis, and bars are each separate React functions. The code uses D3's `scaleBand` for the categorical country axis and `scaleLinear` for the continuous population axis, with data fetched from a CSV URL. The margins and inner plot area are explicitly calculated, and the axes are drawn with white gridlines and blue text labels.