This example displays a bar chart of the ten most populous countries, using horizontal bars to compare 2020 population estimates. The visualization loads data from a CSV file via `d3.csv` and manages it with React state, employing `useState` and `useEffect` to trigger the asynchronous fetch. The chart uses `scaleBand` for the categorical y-axis, `scaleLinear` for the continuous x-axis, and renders the bars as SVG `<rect>` elements. A loading message appears until the data is ready.