The Hierarchy panel provides access to tools to adjust the hierarchical linkage between objects. By linking one object to another, you create a parent-child relationship. Transformations applied to the parent are also transmitted to the child. By linking more objects to both parent and child objects you can create complex hierarchies.
Gyroscope assembled as a hierarchy.
The parent is the outer ring with handle.
The flywheel is the lowest child.
The Hierarchy panel is divided into three areas: