A pie chart displays the top ten weekly product sales in a shop, with each slice sized by the `weeksales` value and colored via `d3.scaleOrdinal`. The code loads CSV data from a GitHub gist using `d3.csv`, computes the pie layout with `d3.pie`, and draws SVG paths with `d3.arc`. Slice labels show formatted sales values, and a legend lists product names with matching colors and values.