Edge definition
An edge (or link) of a network (or graph) is one of the connections between the nodes (or vertices) of the network. Edges can be directed, meaning they point from one node to the next, as illustrated by the arrows in the first figure below. Edges can also be undirected, in which case they are bidirectional, as illustrated by the lines in the second figure, below.
For more information about network edges, see the network introduction.