This example shows a horizontal bar chart comparing the population of thirty countries in 2020, with each bar representing a country and its length scaled by population. The chart uses React components to render SVG elements, with d3.v5 providing the scaleBand and scaleLinear functions to map country names and population values to pixel coordinates. The axis components generate tick marks and labels, while the Marks component draws the bars with native SVG <rect> elements. Data is loaded asynchronously from a CSV file using d3.csv and formatted with d3.format.