This area chart visualizes world population over time, with a shaded region beneath a smooth curve and circular markers at each data point. Built with D3 v5, it uses `scaleTime` and `scaleLinear` for axes, `area` with `curveBasis` for the filled path, and `axisLeft`/`axisBottom` for gridlines. Population data is loaded from a CSV via `csv`, and the SVG output includes labeled axes and a title.