This example displays a horizontal bar chart of the top 20 countries by population in 2010, with countries categorized along the vertical axis and population scaled along the horizontal axis. The chart is built with React and D3 v5, using `scaleBand` for the categorical axis, `scaleLinear` for the numeric axis, and SVG `<rect>` elements as the primary visual marks. Interactive tooltips show the population value for each bar via SVG `<title>` elements. Data is loaded from a remote CSV file using D3's `csv` function, and labels are formatted using the `format` API.