This interactive network graph visualizes a small social network of ten friends, grouped into three clusters. Nodes are rendered as coral circles with labels, while links use varying stroke widths to indicate relationship weights. The example implements a classic force-directed layout using D3 v4’s `d3.layout.force`, with drag interactions and a tick handler updating SVG line and transform positions. Data is loaded from an external JSON file specifying node names, group IDs, and weighted edges.