Type your company name into ChatGPT. If the model produces an accurate, confident summary, your entity signals are working. If it hedges, hallucinates, or declines — you have a string, not an entity. Entity mapping is the discipline of building the structured, corroborated, consistent signals that transform your brand from a text pattern AI models sometimes recognize into a distinct, well-defined entity they can accurately describe and consistently cite. This guide covers the full technical stack: Organization schema with @id and sameAs, Person entities for named authors, Wikidata registration, Google Business Profile optimization, NAP consistency, topical entity association, and a complete implementation checklist with priority order.