This example shows a horizontal bar chart of the ten most populous countries in 2020, using a bar’s length to encode population size. It fetches United Nations population data from a CSV file via `d3.csv`, then renders the bars as SVG `<rect>` elements within a `<g>` group translated by a fixed margin. The chart uses `d3.scaleBand` for the y-axis country categories and `d3.scaleLinear` for the x-axis population values, with React managing the component state and data loading.