This stylized bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. Horizontal bars encode population values on a linear scale, with country names on a band scale and formatted tick labels that convert units to billions. The visualization is built with React and D3 v5, using `scaleBand`, `scaleLinear`, and `format` for axes and data transformation, while marks render as SVG rectangles with hover tooltips. The Poppins font and teal color scheme give the chart a modern, clean aesthetic.