This example visualizes the top 10 most populous countries as horizontal bars, using population data from the United Nations World Population Prospects 2019, loaded via d3.csv. It renders an SVG chart in React, positioning rectangles with d3.scaleBand for the y-axis countries and d3.scaleLinear for the x-axis population values. The code manually draws tick marks and labels using d3’s scale.ticks, while omitting axes entirely, creating a stripped-down, unfinished aesthetic. The chart updates reactively through React’s useState and useEffect hooks.