Overview#Graph is an ABSTRACT Data type and Data Structure that is meant to implement the undirected graph and directed graph concepts from mathematics, specifically the field of graph theory.
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 may refer to a Network topology as a Point-To-Point.