This example shows a small social network of six people arranged as a force-directed graph. Nodes are drawn as blue circles with name labels, while orange links connect friends, with link thickness reflecting the friendship weight. The visualization uses the D3.js v4 library and its `d3.layout.force` API, loading the data from a local JSON file and rendering with SVG. The layout applies gravity, charge, and distance parameters to position the nodes, and the tick handler updates the node and link positions dynamically.