This example visualizes a company hierarchy as a tree diagram, showing the organizational structure from CEO down to individual employees. Nodes use different shapes (circles, rectangles, and polygons) to represent departments, teams, and staff members, with links rendered as smooth bezier curves. The visualization is built with D3.js v7's `d3.hierarchy()` and `d3.tree()` layout functions, which position nodes and generate the tree structure. Each node is rendered as SVG shapes with customizable colors and styles, demonstrating how D3 maps hierarchical data into a spatial network layout.