A pie chart shows average sales by outlet location type, aggregating data from a CSV file. D3.js loads the remote dataset, filters invalid entries, groups by location, and computes mean sales values. The visualization uses d3.pie, d3.arc, and d3.rollup to generate slices, with d3.scaleOrdinal mapping colors and d3.sum calculating percentages for labels. A legend identifies each category, rendered as SVG within a 600x500 canvas.