This area chart visualizes the NASDAQ Composite index over time, with the x-axis representing time and the y-axis representing price. The chart uses a filled area path rendered as SVG, with axis labels and a title. It loads CSV data from a GitHub gist and employs D3 v5 utilities including `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, `area`, and `curveBasis`. The chart includes grid lines with custom tick formatting, converting large numbers to billions using a custom `format` function.