This bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. It uses React and D3 v5, rendering SVG rectangles scaled with `d3.scaleLinear` for population values and `d3.scaleBand` for country categories. The chart includes styled axes, formatted tick labels using `d3.format`, and tooltips via SVG `<title>` elements. Data is loaded asynchronously with `d3.csv` and filtered to the first ten rows.