This scatter plot visualizes McDonald’s menu items, plotting calories against protein with each point colored by food category. Users can click the color legend to highlight a specific category, dimming other points, while hovering over a circle displays a tooltip with item details. The visualization is built with D3 v5, using `scaleLinear`, `scaleOrdinal`, `axisLeft`, and `axisBottom`, and data is loaded from a CSV via `d3.csv`. The chart includes interactive dropdown and legend components, rendered as SVG with mouse event handlers.