This example renders a horizontal bar chart of the top 10 countries by 2020 population, loading data from a CSV file of UN population estimates. The visualization uses React with the `useState` and `useEffect` hooks to fetch and store the data via `d3.csv`, then maps over the dataset to generate SVG `<rect>` elements. Position and size are determined by `d3.scaleBand` for the categorical country axis and `d3.scaleLinear` for the population values, while `d3.max` computes the domain for the linear scale.