This example shows a bar chart of the top 10 countries by population from the UN Population 2019 dataset, rendered as SVG rectangles. It uses React hooks (useState, useEffect) to load and store CSV data via d3.csv, then maps each country to a rect with d3.scaleBand for the y-axis and d3.scaleLinear for the x-axis. The chart updates after data is fetched and displayed as a loading message beforehand. React’s declarative rendering drives the SVG output, while D3 handles the data parsing and scales.