This example visualizes the top 10 countries by 2020 population as horizontal bars using React and D3. It loads CSV data via `d3.csv`, parses the population column, and slices the dataset before rendering. React’s `useState` and `useEffect` manage the asynchronous data fetch, while D3’s `scaleBand` and `scaleLinear` map countries and populations to SVG rectangles. The visualization demonstrates a clean integration of React’s component model with D3’s scaling utilities for data-driven SVG rendering.