This chart displays population estimates and projections over time for various world regions. A legend uses color to distinguish the regional lines. The data is loaded from two CSV files and processed with the `melt` function. The visualization is rendered as an SVG using D3 v5, employing `scaleTime`, `scaleLinear`, and `axisBottom` for axes, and `line` with `curveBasis` for the curves. The lines are colored using `schemeCategory10` and the chart includes a custom color legend.