Editing My 3GPP 24.501 notes (section)

== 4.14 Non-public network (NPN) ==
=== 4.14.1 General ===
Two types of NPN can be deployed using 5GS: SNPN (see subclause 4.14.2) and PNI-NPN (see subclause 4.14.3).

==== 4.14.2 Stand-alone non-public network ====
If the UE is not SNPN enabled, the UE is always considered to be not operating in SNPN access operation mode. If the UE is SNPN enabled, the UE can operate in SNPN access operation mode. Details of activation and deactivation of SNPN access operation mode at the SNPN enabled UE are up to UE implementation.

The functions and procedures of NAS described in the present document are applicable to an SNPN and an SNPN enabled UE unless indicated otherwise.

See spec for details...

=== 4.14.3 Public network integrated non-public network (PNI-NPN) ===

A PNI-NPN is made available by means of e.g. dedicated DNNs or by one or more S-NSSAIs allocated for it. A CAG can be optionally used in order to prevent UEs not allowed to access a PNI-NPN from accessing the PNI-NPN.

See spec for details...