This is a horizontal bar chart displaying the 2020 populations of 30 countries, rendered as SVG rectangles. Built with React and D3 v5, it uses `scaleBand` and `scaleLinear` to map country names and population values to coordinates, with `csv` fetching the data from a GitHub gist. Green bars are overlaid with a tooltip showing the formatted population value, and the chart includes styled axes with blue tick lines and a labeled x-axis.