This visualization shows the top 30 countries by population in 2020 as a horizontal bar chart, with population values formatted in billions and a labeled x-axis. The chart uses D3 v5 scales, including `scaleBand` for the categorical country axis and `scaleLinear` for the population axis, while bars are drawn as SVG rectangles. React components structure the visualization, with `AxisBottom` and `AxisLeft` rendering ticks, and tooltips display each bar's value via an SVG `<title>` element. Data is loaded from a remote CSV file.