This bar chart displays the top 10 most populous countries, with each country’s population encoded as the bar length. The visualization uses React components within an SVG canvas, leveraging D3’s `scaleBand` and `scaleLinear` for axis and bar positioning. Data is loaded via D3’s `csv` fetch from the United Nations World Population Prospects 2019. Hovering over a bar reveals its value through a tooltip formatted with D3’s `format` function, converting numbers to abbreviations like “B” for billions.