This interactive area chart visualizes Microsoft’s monthly revenue across product categories, with each category rendered as a semi-transparent filled region outlined by a colored line. The chart uses D3 v3’s `d3.svg.area()`, `d3.svg.line()`, and ordinal/linear scales, with axes labeled for month and revenue in dollars. A legend identifies categories, and hovering over an area triggers a tooltip showing the category name. Data is loaded from a remote CSV file via `d3.csv`.