Segments and disks can be combined to form a container. Containers allow you to combine storage objects and then subdivide those combined storage objects into new storage objects. You can combine storage objects to implement the volume group concept as found in the AIX and Linux logical volume managers.
Containers are the beginning of more flexible volume management. You might want to create a container in order to account for flexibility in your future storage needs. For example, you might need to add additional disks when your applications or users need more storage.