Chart Type for Relationship / Connection Data. Keywords: network, graph, nodes, edges, connections, relationships, force. Best Chart: Network Graph. Secondary Options: Hierarchical Tree, Adjacency Matrix. When to Use: Mapping connections between entities; network topology or social graph exploration context. When NOT to Use: Node count > 500 without clustering pre-applied; user needs precise connection counts; mobile context. Data Volume Threshold: ≤100 nodes: SVG; 101–500: Canvas; >500: must apply clustering/LOD before rendering. Color Guidance: Node types: categorical colors. Edges: #90A4AE at 60% opacity. Highlight path: #F59E0B. Accessibility: D — Fundamentally inaccessible without alternative. Never use as sole representation. Always provide list alternative.. A11y Fallback: Adjacency list table (Node A → Node B → Weight); hierarchical tree view when structure allows. Library: D3.js (d3-force), Vis.js, Cytoscape.js. Interactive Level: Drilldown + Hover + Drag.