This example shows the cost of product sales from 2000 to 2013 as a smooth area chart, with the filled region underneath the line emphasizing trends over time. Using D3 v5 within a React framework, the code loads CSV data, parses dates and numeric values, and renders an SVG with scaled axes, gridlines, and labeled axis text. The line and area paths are generated using the `d3.line` and `d3.area` generators with `curveBasis` for smooth interpolation, while axes are drawn with `d3.axisLeft` and `d3.axisBottom`.