This area chart visualizes global smartphone sales from 2007 to 2021 using CSV data containing yearly sales figures. The chart employs D3 v5 APIs such as `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and the `area` generator with `curveBasis` to render an orange-filled region beneath the sales trend line. The SVG output includes labeled axes, a red title, and purple axis labels, with sales formatted in billions. Data is loaded asynchronously via `d3.csv` and rendered using a margin-based layout.