3GPP 23.501 v20.2.0 — the document's own text
5.3.1 General
Taught in 9. Registration, reachability and paging (The 5G system architecture, in depth).
The Registration Management is used to register or deregister a UE/user with the network and establish the user context in the network. The Connection Management is used to establish and release the signalling connection between the UE and the AMF.