This stylized bar chart displays the top 10 most populous countries using a horizontal bar layout, with population values formatted in billions and a "Population" axis label. The visualization is built with React and D3 v5, using `scaleBand` for the categorical country axis and `scaleLinear` for the population scale. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv`, and the bars are rendered as SVG rectangles with tooltips showing exact values.