In mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which Graph are formed: an undirected graph consists of a set of vertices and a set of Edges (unordered pairs of vertices), while a directed graph consists of a set of vertices and a set of arcs (ordered pairs of vertices).

## References

“Vertex (Graph Theory).” 2022.

*Wikipedia*, February. https://en.wikipedia.org/w/index.php?title=Vertex_(graph_theory)&oldid=1074286774.