This pie chart displays total sales aggregated by product category from a CSV dataset, with slices color-coded using Tableau10 and labeled directly on the chart. The visualization uses D3 v7 APIs including `d3.csv`, `d3.rollups` for aggregation, `d3.pie` for arc generation, and `d3.arc` for rendering SVG paths. The chart also includes hover effects with a tooltip and a legend, with data loaded from a GitHub-hosted Sales.csv file.