This graphic depicts a three-dimension box labeled Root (CDB$ROOT). Below the Root and on the left, a cylinder with a USB connector plugs into the Root box. The cylinder is labeled Seed (PDB$SEED). Below the box and on the right, a box labeled Application Root is plugged into the Root. The connector is labeled Application Container. Application Root contains a smaller box labeled sales_app. Plugged into the Application Root are Application Seed, cust1_pdb, and cust2_pdb. The latter two are labeled Application PDBs.