This example visualizes the population of the top 20 countries in 2020 as a horizontal bar chart, using bars whose lengths are proportional to each country’s population. It renders with SVG inside a React component, loading data from a CSV file via D3’s `csv` function. The chart uses D3’s `scaleBand` for the y-axis categories and `scaleLinear` for the x-axis values, with React managing the state and rendering the rectangles. No interactive elements are present.