This stylized bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. The visualization uses React and d3.v5, with d3.scaleBand and d3.scaleLinear for positioning, and d3.csv for loading the dataset. Bars are rendered as SVG rectangles with embedded tooltips showing the population value formatted in billions via d3.format. The chart features a Poppins font, teal-colored marks, and styled axes with tick marks and labels.