This example shows a horizontal bar chart ranking the top 10 most populous countries, with country names on the y-axis and population values on the x-axis. The chart loads data from a CSV file using `d3.csv`, sorts and slices the data to the first ten rows, and renders SVG rectangles whose widths are scaled using `d3.scaleLinear`. React manages the component state via `useState` and `useEffect`, while D3 provides the scales, axes, and tick formatting. The visualization demonstrates how React and D3 can be combined to render marks and channels declaratively.