A horizontal bar chart displays the ten most populous countries, using their projected 2020 populations from the World Population Prospects 2019 dataset. The visualization is built with React and D3 v5, rendering SVG rectangles. The code uses `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis, with data loaded via D3's `csv` method and processed in a React `useEffect` hook.