This bar chart displays the 2020 population of 30 countries, sourced from a CSV file, with countries on the y-axis and population on the x-axis. The visualization uses React components to render SVG marks, with d3.scaleBand and d3.scaleLinear for positioning, and d3.format for abbreviating tick labels (e.g., "B" for billions). The code leverages d3.csv for data loading and includes tooltips via SVG `<title>` elements.