CNN typically uses images as data. How? The image is expressed by Vertex(Node) and Edge. graph Composed of Vertex(Node), Edge. In other words, set of Vertex(Node)and Edge. Vertex(Node) It is the fundamental unit of which graphs are formed. Featureless and indivisible objects. Edge(Arc) It represented by a line or arrow extending from one vertex to another. Relationship between vertexes. Sparse G..