Definition
A knowledge graph is a structured database of entities (people, organizations, products, concepts) and the relationships between them. Wikidata is the largest open knowledge graph. Google's proprietary Knowledge Graph powers Knowledge Panel. AI answer engines preferentially cite brands they can verify against a knowledge graph: KG membership is the closest the web has to a 'this is a real entity' signal.
When ChatGPT is asked about Vercel, it grounds in Vercel's Wikidata entry (Q95466787), confirming Vercel exists, is a company, has product lines. Brands without KG presence get fewer citations.
How to optimize
Create a Wikidata entry (free, requires 2-3 third-party citations). For notable brands, an editor will accept a corresponding Wikipedia article. VectorCite's brand-entity signal checks Wikidata automatically.