This visualization displays the ten most populous countries as horizontal bars, ranked by population with the country name on the y-axis and population count on the x-axis. Hovering over a bar reveals the exact population value in a browser tooltip. The chart is built with React and D3 v5, using `scaleBand` and `scaleLinear` for positioning, with SVG rendered elements. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv` and formatted with a custom tick formatter that converts large numbers to abbreviations.