This pie chart visualizes sales by product, with each slice sized according to the product's sales value and colored using a categorical color scheme. The visualization is built with D3.js (v7), using `d3.pie()`, `d3.arc()`, and `d3.scaleOrdinal` to generate and style the chart, with an SVG-based legend and labels positioned via arc centroids. Data is loaded asynchronously from a remote CSV file using `d3.csv`, and the chart is rendered entirely through SVG elements.