This donut chart displays the proportional breakdown of income sources, with three colored segments labeled Sales, Dividends, and Interest. Hovering over a slice reveals a tooltip showing its percentage of the total amount. The visualization uses D3 v5 APIs including `d3.pie`, `d3.arc`, `d3.scaleOrdinal`, and `d3.sum` to calculate and render the arcs. Data is loaded from a CSV file, and the SVG elements are manipulated directly to create the chart and interactive tooltip.