This pie chart visualizes the distribution of gender categories from the Heart2020Cleaned dataset, with each slice proportionally representing the count of occurrences per category. The visualization uses D3 v7’s `d3.rollup`, `d3.pie`, and `d3.arc` to compute and render the slices, while a categorical color scale (`d3.scaleOrdinal` with `d3.schemeCategory10`) distinguishes each group. A legend with colored rectangles and text labels displays each category name alongside its count, rendered as SVG within a Bootstrap-styled HTML page.