Skip Level Hierarchy
A skip level hierarchy is a level based hierarchy, but some of levels are skipped.
In a level based hierarchy, the hierarchy is built based on the levels. A level is a collection of nodes. The relationship between levels is hierarchical.
We can say a level is a parent level of another level. That means that the node in a child level will have a parent node from the parent level.
A skip level hierarchy refers to a hierarchy that include nodes that belongs to a parent node that does not come from the immediate parent level. The node is directly associated with a parent node that from the grandparent level or above.