This example visualizes the top 10 countries by population in 2020 using a horizontal bar chart with a clean, stylized aesthetic. The chart displays population values along the x-axis—formatted in billions with a custom tick formatter—and country names along the y-axis, with bars rendered as dark teal rectangles. Built with React and D3 v6, it employs `scaleBand` for the categorical y-axis, `scaleLinear` for the quantitative x-axis, and SVG `<rect>` elements for each bar. Data is loaded asynchronously from a CSV file using `d3.csv`, and tooltips appear on hover via SVG `<title>` elements.