This pie chart visualizes the net worth of the top 10 billionaires, with each slice labeled with its value in billions and accompanied by a legend listing names and amounts. The code loads CSV data via `d3.csv`, converts values to numbers, and uses `d3.pie` and `d3.arc` to generate SVG paths. Color mapping relies on `d3.scaleOrdinal`, while labels and legends are appended as SVG text and rect elements.