What are the common concepts of multitenant database?

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Multitenant database consists of 
1. CDB is a container database which is similar to standalone database. Called CDB$ROOT 
2. PDB$SEED is a template database to create a database within the CDB databases 
3. PDB<n> are individual or application databases
4. Data dictionary between this databases is shared via internal links called object  link and data link
5. Users between CDB and PDB are different; there will be regular users (starts  with C##) and local users
6. When the CDB starts up, the PDB will be in mount state, and you must open them  exclusively

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