This example renders a horizontal bar chart of the top 10 most populated countries for 2020, using data loaded from a CSV file via D3’s `csv()` utility. React state and the `useEffect` hook manage the asynchronous data fetch, while D3’s `scaleBand` and `scaleLinear` define the y- and x-axes. Each country is represented as an SVG `<rect>` element, with its width proportional to population, and the chart updates reactively once the data arrives.