This scatter plot visualizes the top 10 most populous countries in 2020, using horizontal bars to represent population sizes. The chart is built with React and D3 v5, using `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis, with SVG rendering for the marks and axes. Data comes from the UN World Population Prospects 2019, loaded via D3’s `csv` function and formatted with `format('.2s')` to display population in billions. Hovering over a bar reveals a tooltip with the precise value.