This area chart displays world population trends over time, with the x-axis representing years and the y-axis showing population counts in billions. The chart uses D3 v5 APIs including `scaleTime`, `scaleLinear`, `area`, and `curveBasis` to generate a smooth filled path, while `axisBottom` and `axisLeft` render gridlines and tick labels. Data is loaded from an external CSV file via `d3.csv`, with population values formatted using `d3.format`. The visualization includes rotated axis labels and a centered title, all rendered as SVG elements.