A pie chart displays monthly expenses across five categories—Rent, Food, Travel, Shopping, and Bills—with proportional slices and a matching legend. The visualization uses D3 v7’s `d3.pie`, `d3.arc`, and `d3.scaleOrdinal` to compute arc paths and colors, reading the `pieData.csv` file. Slice labels are placed using each arc’s centroid, while the legend lists categories with values. The SVG output is generated entirely with D3’s declarative API.