This interactive bar chart displays the top 10 most populous countries based on United Nations World Population Prospects 2019 data, with country names on the y-axis and population values on the x-axis. Built with React and D3 v5, the visualization renders as scalable vector graphics (SVG) using `scaleBand` and `scaleLinear` for axes, with tick marks styled via CSS. The chart includes hover tooltips showing population values in a formatted "B" (billion) notation, and the Poppins font from Google Fonts gives the visualization a modern, clean aesthetic.