This example displays a horizontal bar chart of the top 30 countries by 2020 population. The visualization uses the D3 version 5 library with `scaleBand` and `scaleLinear` to map data from a CSV file to SVG rectangles. The React component defines axes with `AxisBottom` and `AxisLeft`, formatting tick labels from scientific notation to billions. Each bar includes a tooltip showing the population value, with data loaded asynchronously via a custom `useData` hook that fetches from a GitHub repository.