This visualization displays Netflix subscriber costs over time, using a smoothed area chart drawn as an SVG. The code relies on D3 v5 functions like `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, `line`, and `area` with `curveBasis` to generate the path. Data is loaded from a CSV file and parsed with `d3.timeParse`. The chart is rendered inside an HTML page with CSS styling, with axis labels and gridlines styled via `.tick` and `.axis-label` classes.