This pie chart visualizes the cost of various phones, displaying each model as a proportional slice of a circle. The chart uses D3 v5 with SVG rendering, loading data from a CSV file via the `csv` function and processing it through `pie` and `arc` generators. Segments are colored using a `scaleOrdinal` palette, with a legend on the right listing each phone name and its price in dollars, formatted with `d3.format`. The data is sourced from a GitHub Gist and rendered entirely in the browser.