Types of graphs on the basis of edges.

Types of graph based on edges:

Simple graph - A graph in which each edge connects two different vertices and where no two

 edges connect the same pair of vertices is called a simple graph. 

Multigraph -  if a pair of vertices have multiple edges connecting them then it is called a multi

 Graph.

 Directed graph - A graph in which whose direction of edges are defined is called directed

   Graph.

  Undirected graph -  A graph in which whose directions are not defined is called undirected

   graph