A node-link social network graph visualizes friend relationships among eight people, with nodes labeled by name and connected by directed edges that indicate a "Friend with" relationship. The graph uses a red fill for all nodes, and hovering over a node highlights it with a green stroke. The layout is computed using d3.forceSimulation with forceLink, forceManyBody, forceCollide, and forceCenter forces, while edges are drawn as SVG lines with markers. The dataset is loaded from data.json, and the visualization is rendered in SVG.