Directed graph
A digraph G = (V, A) is a graph that is made up of a set of vertices connected by directed arcs.
Explanation
Due to the direction, the arcs are drawn as arrows. The elements of V are called the vertices of graph G, and the elements of A are called the arcs of G.
Simple directed graph
Example 1
The arc (a, b) is not the same as (b, a).
Graph with 5 vertices and 9 arcs
