This line chart shows the trend of average engagement over time, with each date aggregated from the dataset and displayed as a smooth, monotone curve. The visualization uses D3.js v7 to parse CSV data, group entries by date, and compute the mean engagement value per day. The chart renders as an SVG with a time-scaled x-axis and a linear y-axis, featuring a seagreen path and circular markers at each aggregated point. The code relies on `d3.csv`, `d3.rollup`, `d3.scaleTime`, `d3.line` with `curveMonotoneX`, and axis generators.