This interactive line graph visualizes cryptocurrency price and market capitalization over time, with dropdown menus allowing users to switch between metrics and coin types. The code uses D3 v5’s `d3.line`, `d3.scaleTime`, and `d3.scaleLinear` to render the SVG path, with smooth transitions via `d3.transition`. Data is loaded from a local `buildings.json` file and parsed using `d3.timeParse`. A React framework is present, though the rendering and animation are handled directly through D3’s SVG and transition APIs.