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Core concept · Entity & Knowledge Graph

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Definition

An entity ID is a unique, persistent identifier assigned to an entity within a structured knowledge system — such as a Wikidata QID, a Google Knowledge Graph ID, or a schema.org identifier. It distinguishes one entity from all others with similar names and links its representations across platforms. AI systems resolve ambiguity by matching entity IDs across sources. When the same identifier appears on a brand’s website, its Wikidata entry, and its schema.org markup, the system can confidently merge those signals into a single authoritative record. Without a stable entity ID, a brand risks fragmentation — its data interpreted as multiple partial entities rather than one coherent presence.

Wikidata QID

sameAs array

Entity record

Knowledge graph

Entity verification

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Entity SEO Context Map