This diagram provides a high-level overview of the 5G System (5GS) architecture and its key interfaces. It shows how the User Equipment (UE), NG-RAN, 5G Core control-plane functions, user-plane functions, and external data networks communicate with each other.

The main interfaces include N1/N2 for UE and RAN signaling, N3/N4/N6 for user-plane traffic, and service-based interfaces such as N5, N7, N8, N10, N11, N22, N27, and N33 between 5G Core network functions. It also highlights 4G EPC interworking, roaming/inter-PLMN connectivity, and access to external application and data networks.