This area chart visualizes global population growth from 1950 to 2015, using a filled path to represent the trend over time. Built with D3 v5, it employs `scaleTime` and `scaleLinear` for the axes, `area` with `curveBasis` for the smoothed area, and `axisLeft`/`axisBottom` for gridlines and labels. Data is loaded from a CSV file using `csv`, with population values formatted in billions.