This area chart visualizes the cost of sales from 2000 to 2013, using a smooth curved line and a light green filled area beneath it. The visualization employs D3 v5 with an SVG rendering approach, using `scaleTime` and `scaleLinear` for the axes, and `area` and `line` generators with `curveBasis` to create the smooth shapes. Data is loaded from a CSV file via `d3.csv`, with the year parsed as a date and cost as a numeric value. The chart includes styled tick labels, a titled axis, and a custom axis label format.