A forked pie chart displays mobile sales brand data from a CSV file, showing each brand's year-to-date sales as a slice with corresponding legends. The chart renders in SVG using D3 v5 APIs including `pie`, `arc`, `scaleOrdinal`, and `select`. Legends show brand names, percentage of total, and sales values in thousands, using `format` for tick labels. Data loads asynchronously via the `csv` method from a GitHub Gist link.