This example visualizes a force-directed graph using D3.js v7, rendering nodes and edges within an HTML page styled with CSS. It employs `d3.forceSimulation` to compute layout physics, with the simulation updating node positions and drawing them as circles and links as lines onto an SVG or DOM element. The code loads data from an external source and dynamically appends SVG elements via D3’s data join, letting the structure respond to the imported dataset. Written as a minimal React-free setup, it demonstrates core D3 v7 APIs for interactive network visualization.