This example shows a bar chart of the ten most populous countries in 2020, with horizontal bars scaled by population size. It loads data from a CSV file using d3.csv, parses the population values with a row function, and manages the asynchronous data through React’s useState and useEffect hooks. The chart renders as SVG elements, using d3.scaleBand for the categorical country axis and d3.scaleLinear for the population axis. React handles the component lifecycle and DOM updates while D3 provides the data loading and scale utilities.