This example displays a horizontal bar chart of the top 10 countries by 2020 population, using data loaded from a CSV file via D3’s `csv` utility. It combines D3’s `scaleBand` and `scaleLinear` to map country names and population values to SVG `rect` elements, while React’s `useState`, `useEffect`, and `useCallback` manage the asynchronous data loading and rendering state. The chart updates only after the data arrives, showing a static list of bars scaled to the maximum population value.