This is a force-directed social network graph built with D3 v4 and rendered as SVG. It uses `d3.layout.force` to position nine named nodes connected by eight weighted links, with stroke width proportional to link weight. Each node appears as a blue circle with a red text label, and nodes are draggable via `force.drag`. The layout applies gravity, distance, and charge settings to arrange the network, updating positions on each tick. Data comes from an external `graph.json` file.