This interactive bar chart displays the population figures for 30 countries in 2020, with country names on the y-axis and population on the x-axis. Built with React and D3 v5, it uses `scaleBand` and `scaleLinear` to map the data, rendering SVG rectangles via the `Marks` component. The chart features custom tick marks and labels, with population values formatted using `d3.format(‘.2s’)` and converted to billions. The data is loaded from an external CSV file using D3’s `csv` function, and tooltips show the precise population on hover.