This pie chart visualizes sales by category, displaying five segments for electronics, furniture, clothing, and toys. The chart uses D3.js v7 to load the sales.csv dataset, then applies `d3.pie()` and `d3.arc()` to compute slice geometries, with `d3.scaleOrdinal` and `d3.schemeTableau10` assigning colors. It renders as SVG with category labels positioned via `labelArc.centroid()` and includes a legend showing each category and its value. Hovering over a slice reveals a tooltip with the category name and numeric value.