A force-directed network diagram displays eight named nodes connected by five links, rendered as green circles with red outlines and red connecting lines. Built with D3 v4, the visualization uses `d3.forceSimulation` with `forceLink`, `forceManyBody`, and `forceCenter` to position the nodes, while an SVG container hosts the rendered elements. The code enables interactive dragging through D3's drag behavior, allowing users to move nodes and observe the simulation's tick updates as positions recalculate in real time.