This example displays a pie chart of mobile sales by brand, with each slice labeled by its sales value and accompanied by a legend showing brand names and corresponding figures. It imports data from a CSV file using `d3.csv` and renders the chart as an SVG. The pie layout (`d3.pie`) and arc generators (`d3.arc`) create the slices, while a `scaleOrdinal` maps sales values to a fixed array of section colors, with text and legend elements positioned manually.