This pie chart displays the proportional usage of different programming languages using arcs sized by percentage from a CSV file. The visualization loads external data via `d3.csv`, applies the `d3.pie` layout to compute angles, and renders slices with `d3.arc` using an SVG `path` element. Each slice’s color is assigned through a `d3.scaleOrdinal` with the `d3.schemeCategory10` palette, based on the index of the data points. The chart is drawn within a fixed 500x500 SVG container.