This area chart visualizes yearly sales data in thousands, with a smooth curved line marking the trend and a green filled area beneath it. The chart uses D3 v5’s `scaleLinear` for both axes, `line` and `area` generators with `curveBasis`, and `axisBottom`/`axisLeft` for labeled ticks. Data is loaded from a remote CSV via `d3.csv`, with sales values parsed as numbers. The visualization highlights the rise and fall of sales over time, emphasizing the magnitude of change through the filled area.