This example visualizes a social network as a directed graph, showing how individuals are connected through friendship links. Nodes represent people with a consistent cyan color and circle shape, while lines with arrow markers depict the direction of each friendship relationship. The graph uses `d3.forceSimulation` with link, charge, collision, and center forces to position nodes, with drag interactions enabled. Data comes from a local `data.json` file containing nodes and links with relationship attributes, and hover states are styled via CSS classes.