This chart shows iPhone sales over time, combining a smooth line with a shaded area beneath it to emphasize the trend in annual sales figures. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `line`, and `area` generators with a `curveBasis` interpolation. Data is loaded from a CSV file and parsed with `d3.timeParse`, while axes are rendered via `axisLeft` and `axisBottom`. The SVG includes formatted tick labels and rotated axis titles, with the area fill styled in blue and the line in black.