This pie chart visualizes the distribution of pizza orders by category, with each slice labeled with its count and a legend identifying the categories. The code loads data from a GitHub Gist CSV file using `d3.csv`, calculates category frequencies through manual aggregation, and renders the chart as SVG with `d3.pie` and `d3.arc`. Slices use a `d3.scaleOrdinal` color scale with `d3.schemeCategory10`, and labels are positioned via `arc.centroid`. The legend is built manually, mapping rectangles and text to each category.