Hierarchy is simply defined as any system of persons or things ranked one above another. It is a system that helps as define order and organization.
Hierarchy can link entities either directly or indirectly and either vertically or diagonally.
It shows the relationship between the entities. Indirect hierarchical links can extend vertically upwards or downwards via multiple links in the same direction.
Hierarchy is not only explain's how that system functions but also aids in predicting how any changes in the system will effect the system as a whole.
A good web design is supported by good hierarchical system. If hierarchy is successful, it should support the website's goals.
Hierarchy constructing a fully functional system, it provides a path to the viewer.
