This bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. Built with React and D3 v5, it uses `scaleBand` and `scaleLinear` for axes, with `format('.2s')` to abbreviate population numbers (e.g., "1.4B"). The visualization renders as SVG with custom axis components and a tooltip via the `<title>` element, styled with Poppins font and a teal color scheme.