NF
Network Function: a processing function in the 5G network that has defined functional behavior and interfaces. NFs can be implemented as virtualized or containerized microservices.
NF is the generic term for any building block of the 5G network with a defined behaviour and defined interfaces — AMF, SMF, UPF, PCF and the rest are all NFs. The word matters because of how these are built in 5G: an NF is a logical function, not a physical box, and it's typically realised as virtualized or containerized software you can instantiate, scale, and move.
A couple of distinctions that trip people up. An NF can be further decomposed into NF services (the units the SBA actually exposes and that other functions consume), and a single logical NF may run as many NF instances behind a load balancer for capacity and resilience. Because they're software with standard interfaces, you can scale one NF type independently of the others, place them where it makes sense (edge vs central), and upgrade them on their own schedule — which is the whole operational point of a cloud-native core.
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