This example visualizes a small social network graph, showing eight people connected by friendship links and rendered as yellow circles with labels. A force-directed layout using `d3.forceSimulation` positions nodes, with `d3.forceLink` defining edges based on a JSON data file containing source, target, and relationship attributes. SVG elements create nodes and links, while drag interaction via `d3.drag` lets viewers reposition nodes, and mouseover events highlight nodes with a green stroke.