This area chart shows the total annual iPhone sales over time, with a single steelblue filled path representing the sales trend. The visualization loads data from a remote CSV file, aggregates the quarterly figures per year, and uses D3 v7’s `d3.area()` generator to create the shape. Axes are added with `d3.axisBottom` and `d3.axisLeft`, while time and linear scales (`d3.scaleTime`, `d3.scaleLinear`) map years and sales values. The SVG rendering includes labeled axes for clarity.