This example shows a horizontal bar chart of 2020 population estimates for 30 countries, with each bar’s length proportional to population and a tooltip displaying the value in billions. The visualization is built with React and D3 v5, using `scaleBand` and `scaleLinear` to map country names and population values to screen coordinates. Data is loaded via `d3.csv` from a GitHub repository, axes are rendered as SVG elements with tick marks, and bars are drawn as `rect` elements using the `Marks` component. The chart includes a labeled x-axis and uses a green fill for all bars.