This example shows a donut-style pie chart of product sales loaded from a CSV file, with an ordinal color scale and a legend. Built with D3 v7, it uses `d3.pie()` and `d3.arc()` to generate the slices, while `d3.scaleOrdinal()` and `d3.schemeTableau10` assign colors. Tooltips appear on mousemove over each arc, and labels display for products with sales values above 90. The chart is rendered as SVG within an HTML page, styled by a linked stylesheet.