This example displays a horizontal bar chart of the top 10 most populous countries in 2020, using United Nations World Population Prospects 2019 data. The visualization shows country names along the y-axis and population counts on the x-axis. Built with React and D3 v5, the code uses `scaleBand` and `scaleLinear` to compute scales, while React's `useState` and `useEffect` handle data loading. The SVG output includes grid lines and tick labels generated from `xScale.ticks()`, and the chart fills the available space with proper margins.