## Vertex = Node = Point

A graph is a diagram consist of a set of points and a set of lines or arcs. Graph theory is equal to Graph story. It is a story about the points and arc.

In the beginning, in the family name
*
Graph
*
, there is a point. This point is called a
*
vertex
*
. It is an isolated point of Graph. It feels so lonely.

Teknomo, Kardi (2015) Pictorial Introduction to Graph Theory. http:\\people.revoledu.com\kardi\tutorial\GraphTheory\