In this animation the structure and representation of directed
graphs is presented as well as the possibility to change a
non-directed graph into a directed one.
Following that the terms
path (any sequence of edges which have the same
direction)
edge-simple path (a path in which no edge may
appear twice)
simple path (a path in which no edge and no node
may appear twice)
and length of an path, edge-simple path or simple path