A pie chart visualizes the distribution of fitness goals from a cleaned CSV dataset, showing the count of each goal category with color-coded slices and an accompanying legend. The D3.js v7 code loads the data via `d3.csv`, aggregates counts using `d3.rollup`, and renders the chart with `d3.pie` and `d3.arc`, applying a `d3.scaleOrdinal` with `d3.schemeSet2` for colors. Labels are placed at arc centroids, and the SVG output includes a legend built with appended rectangles and text.