A social network graph visualizes six people connected by weighted links, with each person represented as a pink circle labeled by name. The force-directed layout positions nodes dynamically, and link stroke widths reflect relationship weights. The example uses d3.v4 with the legacy `d3.layout.force` API to simulate physics and render an SVG, loading data from the `graphFile.json` file. Nodes are draggable, and the tick handler updates link coordinates and node transforms.