This pie chart visualizes the distribution of mobile app users across five behavior classes—from minimal to addicted users—based on categorical data loaded from a remote CSV. Each slice is colored using `d3.scaleOrdinal` with `d3.schemeSet2`, and the chart animates its initial appearance via `transition.attrTween` with an interpolated arc. Hovering translates slices outward using `arc.centroid`, while percentage labels and a legend clarify proportions. The SVG rendering includes simulated axis labels, and the code relies on `d3.pie`, `d3.arc`, and `d3.rollup` to aggregate counts.