This visualization displays population trends over time for global regions, using multiple colored lines to represent each region’s population from 1950 to 2100. The chart leverages d3’s `scaleTime`, `scaleLinear`, `axisBottom`, and `axisLeft` to render axes, while `line` with `curveBasis` draws smooth paths. Data is melted from UN population estimates, combining historical and projected figures. A `colorLegend` highlights region names, with lines sorted by their final population value.