This example visualizes world population data for the top ten countries in 2020, displayed as horizontal bars whose widths correspond to population size. It fetches CSV data from a GitHub gist using D3’s `csv` method, then processes and sorts the rows before rendering. The chart is built with React components that generate SVG `rect` elements, scaled using D3’s `scaleBand` for country categories and `scaleLinear` for population values. The visualization updates reactively as data loads, with D3 v5 and React 16.9 handling the data flow and SVG rendering.