This multi-series line chart displays monthly trends in screen time, sleep hours, and productivity by aggregating daily records from the digital usage dataset into monthly averages. Three colored lines, generated with d3.line and scaled using d3.scaleTime and d3.scaleLinear, allow direct comparison of how these behavioral metrics change over time. The SVG chart includes gridlines, labeled axes, a legend, and uses d3.rollup to compute monthly means from the CSV data before rendering.