This interactive line chart displays Apple stock prices over time, spanning from 1977 through 1982. The visualization uses a green-to-red vertical gradient to encode price levels, with higher values appearing greener and lower values redder. Users can hover over the chart to see a tooltip with the exact price at any date, indicated by a black circular marker that tracks the cursor along the line. The chart is built with D3.js v4 and React, reading data from a remote CSV file, and renders as an SVG with a bisector-based search to find the closest data point to the mouse position.