This example visualizes a small social network with five people and their connections as a force-directed graph rendered in SVG. It loads node and link data from a JSON file, drawing each person as a green circle and each relationship as a gray line. The layout is computed dynamically using d3.forceSimulation, which applies forces for pairwise repulsion (d3.forceManyBody), edge-based attraction (d3.forceLink), and centering (d3.forceCenter). As the simulation runs, a ticked callback updates the positions of the circles and lines, letting the network settle into a readable arrangement.