This example visualizes a social network of seven people, using nodes and directed links to show friendship relationships. The graph layout is computed with `d3.forceSimulation`, applying link, charge, collision, and center forces to position nodes and edges dynamically. Dragging nodes is supported via `d3.drag`, and hovering highlights a node with a red stroke. The SVG rendering includes arrowheads on lines, with node labels displayed directly on each circle. The dataset is loaded from `data.json`, which specifies nodes and their pairwise links.