This bar chart visualizes the top 10 most populous countries using United Nations World Population Prospects 2019 data, rendered with React and D3.js (v5). The chart displays horizontal bars ordered by population, with formatted tick labels (e.g., “1.4B”) and interactive tooltips showing exact values. D3’s scaleBand and scaleLinear handle axes and positioning, while React components (AxisBottom, AxisLeft, Marks) compose the SVG output. The bottom axis includes custom formatting via D3’s format API, and the styling uses the Poppins font.