This example shows a population pie chart for ten countries in 2019, using colored slices with percentage labels and a legend. Data is loaded from a CSV file via the `d3.csv` function. The visualization is built with React and rendered as SVG using D3 version 5 components, including `d3.pie` and `d3.arc` for generating the slices, and `d3.format` for percentage labels, while the chart is drawn inside a `<div>` element.