This bar chart visualizes the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset, using horizontal bars to encode population size. The chart omits axes by design, instead relying on interactive tooltips to display values. Built with React and D3 v5, it uses `d3.scaleBand` for the categorical y-axis and `d3.scaleLinear` for the x-axis, rendering as an SVG. D3’s `format` function converts large numbers into abbreviated forms like "1.4B" for the tooltips.