Definition
A knowledge graph is a structured database of entities (people, organizations, places, products) and the relationships between them, used by search engines and AI systems to understand the world beyond keywords. Google's Knowledge Graph, introduced in 2012, powers knowledge panels and feeds into AI Overviews; Bing maintains a similar entity index that informs Microsoft Copilot answers. AI language models also build implicit knowledge graphs from training data — they store entity facts in model weights and retrieve them during generation. For GEO, the knowledge graph determines whether an AI engine recognizes your brand as a real, distinct entity or confuses it with similarly named things. Strengthening your knowledge graph presence requires consistent structured data (Organization JSON-LD with @id), verified profiles on authoritative platforms (Wikipedia, Wikidata, Crunchbase), and editorial coverage that connects your brand name to specific attributes. A brand with a strong knowledge graph entry gets cited with confidence; a brand without one gets hedged or omitted.