Radio Access Technology (RAT)
A radio access technology is a particular radio standard used to connect devices to a network, such as GSM, UMTS, LTE, NR or Wi-Fi.
What is Radio Access Technology (RAT)?
Devices and networks often support several RATs and can move between them, for example between 4G and 5G. An "inter-RAT" handover is a switch from one technology to another.