This stylized bar chart displays the top 10 most populous countries for 2020, using horizontal bars to compare population sizes. The visualization is built with React and D3 v5, employing `scaleBand` and `scaleLinear` for positioning, with SVG rectangles rendered as marks. Data comes from the United Nations World Population Prospects 2019 dataset, loaded via `d3.csv`. Hovering over a bar reveals a tooltip with the population value, formatted using `d3.format` to show abbreviations like "B" for billions.