This example shows a simple network graph with three nodes connected by two links, rendered as SVG circles and lines inside a fixed-width container. The code uses D3 v7’s `forceSimulation`, `forceManyBody`, `forceLink`, and `forceCenter` to position the nodes, with the simulation’s tick event updating the circle and line coordinates. Node and link data are hardcoded as arrays, and the visualization includes drag functionality via the imported `drag` API, though it is not explicitly invoked in the shown code.