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A Graph DataBase is a NoSQL-type Database system based on a topographical network structure. The idea stems from graph theory in mathematics, where graphs represent data sets using nodes, edges, and properties.
Nodes or points are instances or entities of data which represent any object to be tracked, such as people, accounts, locations, etc.
Edges or lines are the critical concepts in graph databases which represent relationships between nodes. The connections have a direction that is either unidirectional (one way) or bidirectional (two way).
Properties represent descriptive information associated with nodes. In some cases, edges have properties as well.
Source: https://phoenixnap.com/kb/graph-database