This example shows a horizontal bar chart of population estimates for the top 10 countries, rendered as SVG via React. It uses D3’s `csv` loader to fetch data from a UN population CSV and stores it in React state. The chart draws axes manually with `scaleBand` and `scaleLinear`, maps ticks to grid lines and labels, and renders bars with `rect` elements. The code demonstrates a hybrid approach where React manages the DOM while D3 provides scales, data parsing, and tick generation.