Vocabulary:
1. Graph- a collections of vertices and edges
2. Vertex - a point on a graph
3. Edge - a line or curve connecting vertices on a graph
4. Euler Path - a path which uses every edge of the graph exactly once
5. Euler Circuit - a path which uses every edge of the graph exactly once and ends at the vertex where it began
6. Degree of a vertex - the number of edges connected to that vertex