This interactive pie chart visualizes product sales distribution across years, with a dropdown selector allowing users to switch between 2018 and 2024 data. The chart displays percentage labels on slices larger than 5% and includes a color-coded legend for product identification. Built with D3 v7, the example uses d3.csv to load product sales data, d3.pie for arc generation, d3.arc for slice paths, and d3.scaleOrdinal with d3.schemeCategory10 for colors. All elements render as SVG within a styled HTML container.