This example presents a pie chart visualizing sales distribution by item category, with each slice labeled by category and total sales amount. The chart is rendered as an SVG within an HTML page. It loads data from a remote CSV file and aggregates it using `d3.rollups` and `d3.sum`. The visualization is built with D3 v6, using `d3.pie` for the arc geometry, `d3.arc` for paths and label positioning, and `d3.scaleOrdinal` with `d3.schemeCategory10` for colors. A legend and title/subtitle are also included.