# Knowledge Graph (KG) A Knowledge Graph (KG) is a term used for different things. Here, I focus on its meaning in the context of [[Knowledge Management (KM)]] and [[Personal Knowledge Management (PKM)]] in particular. A Knowledge Graph, or Personal Knowledge Graph the underlying data structure created by connecting notes with one another (i.e., creating links between notes). It can be compared to the World Wide Web, which is the biggest knowledge graph in existence, created by the links between Web pages. [[Tools for Thought (TfTs)]] often include a graph view, a way to visualize the knowledge graph. It is generally represented as an infinite canvas where nodes are notes and edges are links (direct or indirect) between those notes. Here's a simple visualization of what it represents: ![[Knowledge Graph example.png]] And here's what my (Personal) Knowledge Graph in Obsidian looks like: ![[Knowledge Graph (KG) - My KG 2025-07-22.png]] Zoomed in: ![[Knowledge Graph (KG) - 2025-07-22 My KG Zoom.png]] It's a [[Web of knowledge]]. ## Knowledge Graphs in AI Beyond personal knowledge management, knowledge graphs power AI retrieval systems. They enhance [[Retrieval-Augmented Generation (RAG)]] by providing structured context that vector similarity alone can't capture. Instead of just finding "similar documents," a KG traverses relationships: "this concept is a subtype of that concept, which was invented by this person, who also worked on that project." Graph RAG combines traditional [[Semantic Search]] with knowledge graph traversal, building community summaries and relationship-aware retrieval. This addresses the weakness of pure vector search: finding relevant information that is semantically distant but structurally connected. The parallel between PKM and AI knowledge graphs is that both are forms of [[Knowledge Distillation]]: raw information gets distilled into atomic units (notes or entities), connected through meaningful relationships (wikilinks or edges), creating a structure where emergent insights arise from the connections, not just the content. ## Related - [[Personal Knowledge Graph (PKG)]] - [[Knowledge Management (KM)]] - [[Personal Knowledge Management (PKM)]] - [[Personal Knowledge Management System (PKMS)]] - [[Web of knowledge]] - [[Retrieval-Augmented Generation (RAG)]] - [[Semantic Search]] - [[AI Retrieval Patterns]] - [[Knowledge Distillation]] - [[Atomic notes]] - [[Zettelkasten method]]