Oracle 19C Non-CDB vs Multitenant Architecture

Oracle 19C Non-CDB vs Multitenant Architecture
CDB - Container Database
PDB - Pluggable database
A container is logical collection of data or metadata within the multitenant architecture.
A PDB contains the data and code required for a specific set of features see PDBs. For example, a PDB can support a specific application, such as a human resources or sales application. No PDBs exist at creation of the CDB. You add PDBs based on your business requirements.
The multitenant architecture solves several problems posed by the traditional non-CDB architecture.
show pdbs
show con_name
CON_NAME
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CDB$ROOT