The Knowledge Graph is a structured knowledge base used by Google (and analogously by other AIs) to understand entities (people, companies, places, concepts) and the relationships between them. In GEO, strengthening your entity's presence in the Knowledge Graph improves your chances of being recognized and cited by AIs.
AIs no longer reason in "keywords" but in "named entities". They understand that "PingPrime" is a "GEO agency", based in "Brussels", founded by "Sabrina Bulteau" and "Olivier de Decker". The clearer and more documented these relationships are, the more confidently AI cites your brand.
The main levers are Organization and Person schema markup, creating a Wikidata entry, an optimized Google Business profile, detailed Crunchbase and LinkedIn profiles, and consistent mentions on third-party sources. It's a key part of PingPrime's IDO methodology.