A NoSQL database option. That is, a database that doesn't rely on SQL (Structured Query Language). Graphs are connected networks of inforamtion. Vertices are connected by edges. Vertices are often called resources (an identifier for a person, place, record) whose edges then describe it - edges are the properties belonging to a resouce. Edges can be resources in their own right as an edge may have its own meaning and semantic rules.

A simple graph may be:

Subject (Resource) -> Predicate (property name) -> Value (property value)

The USA -> hasStates -> 52

A graph database is queried through a language called SPARQL (SPARQL Query Language).

Graph databases are extensible meaning it is easy to add and connect more properties and resources.

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