A horizontal bar chart displays the 2020 population of 30 countries, ranked in descending order from the dataset loaded via `d3.csv` from a GitHub-hosted CSV file. The visualization uses `scaleBand` for the categorical y-axis, `scaleLinear` for the quantitative x-axis, and renders bars as SVG `<rect>` elements. Custom `AxisBottom` and `AxisLeft` components generate ticks, while a `<title>` element provides tooltips with formatted values like "30M". The React app manages data loading asynchronously with a `useEffect` hook.