This
hierarchical structure is found in computers and allows the logical collection
of information into groups. It is the workhorse of the web as it allows a website
to place the most important information of a category on a higher level than
other less important data. Links from one central page allow the user to define
their website experience by accessing whatever they like. They dive down through
the levels to access the data of their choice.
This structure is good for users with prior experience online as they will have had exposure to this type of structure.
Image courtesy (S.Cochran, ENIC3020 Lecture Notes, 2007)