In mathematics, Graph Theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of vertices (also called nodes or points) which are connected by edges (also called links or lines).

This particular example shows a graph of financial tickers with links that represent the statistical correlation of their daily closing prices over a period of a year. Where the correlation number is between 1 and -1, with 0 being no correlation in either direction.

- https://en.wikipedia.org/wiki/Graph_theory - https://en.wikipedia.org/wiki/Correlation