This example shows monthly gross profit and units sold over time, with two line charts sharing a time axis. It uses D3 v5 and React, loading data from a CSV file via `d3.csv`. The code employs `scaleTime`, `scaleLinear`, `axisBottom`, and `axisLeft` to render the axes, while `line` draws the paths. The visualization compares two metrics across the same 2020–2021 period, with points and lines styled from the data.