This example shows a horizontal bar chart ranking the ten most populous countries in 2021, using data loaded from a CSV file. The visualization applies the margin convention to position the chart within an SVG canvas, with a band scale for country categories and a linear scale for population values. React manages the component state and renders the rectangles, while D3’s `csv` utility fetches and parses the data. The chart displays population sizes proportionally, with country names on the y-axis.