This is a horizontal bar chart that ranks the top 30 countries by their 2020 population. The chart uses a light green bar for each country, with a blue x-axis and a blue y-axis, showing the population in billions on the x-axis. The visualization is built using React and D3 v5, with the `scaleBand` and `scaleLinear` functions from `d3` to map the data on the SVG canvas. The data is loaded from a GitHub CSV file and the population values are multiplied by 1000. The marks are `rect` elements with a tooltip displaying the formatted population value.