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Neo4j is a database technology based on the graph data model. It organizes data in nodes connected by relationships, with both nodes and relationships supporting properties that provide additional information. This enables sophisticated queries that can traverse complex networks of interconnected data with the Cypher query language. Designed to handle large amounts of structured, semi-structured, and unstructured data, Neo4j has uses cases across sectors like social networking, recommendation engines, fraud detection systems, network and IT operations management (ITOM), real-time search applications and government intelligence analysis.