This pie chart visualizes the number of unique products purchased across different shopping malls, with each slice colored and labeled by product count. Built with D3 v5, the visualization uses `d3.pie` and `d3.arc` to generate segments, `d3.scaleOrdinal` for color mapping, and `d3.format` for numeric tick labels. Data is loaded from a CSV file via `d3.csv`, and the SVG rendering includes interactive legends displaying mall names and corresponding values.