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+# Graph
+
+A graph data structure consists of a finite (and possibly 
+mutable) set of vertices or nodes or points, together 
+with a set of unordered pairs of these vertices for an 
+undirected graph or a set of ordered pairs for a 
+directed graph. These pairs are known as edges, arcs, 
+or lines for an undirected graph and as arrows, 
+directed edges, directed arcs, or directed lines 
+for a directed graph. The vertices may be part of 
+the graph structure, or may be external entities 
+represented by integer indices or references.
+
+![Graph](https://www.tutorialspoint.com/data_structures_algorithms/images/graph.jpg)
+
+## References
+
+[Wikipedia](https://en.wikipedia.org/wiki/Graph_(abstract_data_type))