NetWare Directory Services operates in a logical organization called the Directory tree. It is called a Directory tree because objects are stored in a hierarchical tree structure, starting with the root object and branching out.
Two types of objects make up the Directory tree: container objects and leaf objects.
A branch of the Directory tree consists of a container object and all the objects it holds, which can include other container objects.
Leaf objects are at the ends of branches and don't contain any other objects.
In a Directory tree, you can place container objects and leaf objects in different configurations, according to what best fits your company's needs.