A step-shaped line chart displays Google stock closing prices (GOOGL) from March 2016 to March 2021, with a hover tooltip showing the exact price and date. The visualization uses React with SVG rendering, relying on d3.scaleTime and d3.scaleLinear for axes, d3.line with curveStep for the path, and d3.bisector for nearest-point lookup. Interactive tooltips are implemented through React state and mouse events, while the multiFormat time axis adapts its tick labels based on date granularity. Data loads asynchronously via d3.csv from a remote gist.