This example visualizes the distribution of exercise levels as a pie chart, with slices labeled directly on the chart and a legend showing each category’s count. It loads data from a CSV file using d3.csv, converts values to numbers, and renders the pie using d3.pie and d3.arc in an SVG. The chart applies a categorical color scheme via d3.scaleOrdinal with d3.schemeCategory10, and positions labels using arc centroid calculations. The visualization is built entirely with D3 v7, rendering to SVG with a centered chart group and a right-side legend.