A bar chart displays the top 10 most populous countries for 2020, using data from the United Nations World Population Prospects 2019. Horizontal bars encode population with a linear scale, while country names appear on the y-axis. The visualization is built with React, using `d3.csv` for data loading, `scaleBand` and `scaleLinear` for scales, and SVG rectangles for rendering. Tooltips show formatted population values, and axis labels are drawn as SVG text.