This area chart visualizes Bitcoin prices from 2011 to 2021, showing an upward trend with fluctuations. The chart uses D3 v7 to load CSV data and render SVG paths, employing `d3.scaleTime`, `d3.scaleLinear`, and `d3.axisBottom`/`d3.axisLeft`. The area generator (`d3.area`) with a basis curve fills the space between the line and baseline in maroon, while gridlines and axis labels clarify the year and price values.