A structure made up of different levels like a company organization chart. The higher levels have control or precedence over the lower levels. Hierarchical structures are a one-to-many relationship; each item having one or more items below it.

File Systems Are Hierarchical
The system for organizing files on a hard disk is typically structured as a hierarchy. The desktop is often placed at the top of the hierarchy, followed by folders and subfolders within the folders. See Win Explorer and file system.