This visualization presents the global population over time as a filled area chart, with a maroon region beneath a smooth curve. The data comes from a CSV file called `world-population-by-year-2015.csv`, loaded via `d3.csv`. The code uses D3 v5 functions such as `scaleTime`, `scaleLinear`, `area` with `curveBasis` for the curved path, and `axisBottom` and `axisLeft` for the axes, with gridlines and tick formatting. The y-axis labels abbreviate large numbers, converting billions from "G" to "B".