This example visualizes the top 10 most populous countries in 2019 using a horizontal bar chart, with population values on the x-axis and country names on the y-axis. Each bar includes a tooltip showing the formatted population value. The chart is built with React, rendering SVG elements, and uses D3.js scales (scaleBand and scaleLinear) with the d3.csv loader to fetch United Nations World Population Prospects data, while d3.format formats tick labels from billions to abbreviated strings.