This D3.js (v5) pie chart visualizes the proportional sales share of three customer segments—Consumer, Corporate, and Home Office—using data loaded from a CSV file. The chart employs `d3.pie` to compute arc segments, `d3.arc` for the pie geometry, and a categorical color scale from `d3.scaleOrdinal` to differentiate segments. An interactive legend displays each segment’s label and its percentage value, formatted with `d3.format`. The SVG canvas is 1280×800 pixels, with the pie centered and legends positioned to the right for clarity.