This example visualizes a small social network of six people, grouped into three clusters, with weighted links indicating connection strength. The graph uses a force-directed layout via `d3.layout.force` to position nodes, which are rendered as orange circles with blue outlines and labeled with purple text. Links appear as black lines whose stroke width reflects each link’s weight. Nodes are draggable, and the simulation updates positions continuously on each tick. Data comes from a local JSON file, and the visualization is drawn as SVG.