This pie chart visualizes the distribution of iris flower species from a CSV dataset, showing the proportion of each species in the collection. The chart uses d3.pie and d3.arc to generate the pie slices, with an ordinal color scale from d3.schemeCategory10. A custom legend is built using HTML divs alongside the SVG chart, displaying color-coded species labels. The data is loaded and aggregated with d3.csv and d3.rollups, and the visualization is rendered as an SVG within a flex container.