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Data Modeling Concepts and Techniques | Neo4j A label is a named graph construct that is used to group nodes into sets. All nodes labeled with the same label belongs to the same set. Many database queries can work with these sets instead of the whole graph, making queries easier to write and more efficient. A node may be labeled with any number of labels, including none, making labels an optional addition to the graph. Since a relationship always has a start and end node, you cannot delete a node without also deleting its associated relationships. relationships nouns nodes and labels ...