This network graph visualizes city connections loaded from a CSV file, with each node representing a city and edges drawn as links between connected cities. Using D3.js v7, the example employs `d3.forceSimulation` with `d3.forceLink`, `d3.forceManyBody`, and `d3.forceCenter` to calculate node positions and render them as SVG circles with a `d3.scaleOrdinal` color palette. Nodes are draggable via D3’s drag behavior, and a hover tooltip shows each city’s name.