This bar chart displays the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset. Horizontal bars represent each country’s population, with a formatted x-axis showing values in billions. Built with React and D3 v5, the visualization uses `scaleBand` for the categorical y-axis, `scaleLinear` for the numeric x-axis, and SVG `<rect>` elements rendered via React components. Native SVG `<title>` elements provide tooltips showing exact population values on hover.