This interactive stacked bar chart visualizes 2018 general project funding items by institution nature, breaking down sales data across sub-categories and customer segments. Built with D3.js, it uses `d3.nest()`, `d3.layout.stack()`, and ordinal/linear scales to render grouped layers. Hovering over the color legend highlights specific segments, while `d3-tip` displays detailed tooltips with item counts. The SVG animation supports fade effects between base and foreground bar layers for comparative analysis.