This visualization displays the top 10 most populous countries as horizontal bars, using United Nations World Population Prospects 2019 data loaded via d3.csv. React components render SVG elements, with d3.scaleBand positioning countries on the y-axis and d3.scaleLinear mapping population values to bar widths. The d3.format function applies SI notation to axis ticks, converting values like "1.3G" to "1.3B". Color-coded teal bars include native SVG tooltips showing precise population figures on hover.