This interactive dashboard presents three linked D3.js v7 visualizations built from the classic cereal dataset of 77 products. It shows a bar chart of average calories by manufacturer, a scatter plot of sugar content versus consumer rating with hot/cold cereal color encoding, and a multi-series chart combining average calories as bars with average rating as a line across manufacturers. The code uses D3's `rollup`, `scaleBand`, `scaleLinear`, `axisBottom`, and `axisLeft` APIs for data aggregation and chart construction, rendered as responsive SVGs with a dark theme, gridlines, tooltips, and a legend.