This visualization displays the top 10 most populous countries as a horizontal bar chart, using the United Nations World Population Prospects 2019 dataset. The React component manages state and lifecycle while D3’s `scaleBand` and `scaleLinear` handle positioning. Axes are manually constructed with D3’s `ticks()` method, rendering grid lines, tick labels, and country names as SVG elements. The chart includes minimal styling and no axis titles, presenting a raw, functional view of the data distribution.