This pie chart visualizes the proportional breakdown of a CSV dataset by category, using Value1 as the numeric weight for each slice. Built with D3 v7, it renders as an SVG with slices colored via a categorical color scheme, and each slice is labeled with its category name. The chart includes a legend that maps colors back to categories, generated from the same data. The code constructs the pie using `d3.pie()` and draws arcs with `d3.arc()`, calculating slice paths and centroids for label placement.