ABM
ABM Stands for Apple Business Manager.
DEP
DEP stands for Device Enrollment Program.
MDM
MDM stands for Mobile Device Management.
MFA
MFA Stands for Multi Factor Authentication. This is a standard in security practices where passwords are no longer used as the single form of authentication and multiple forms are required before you can gain access to your account or data.
OOBE
OOBE stands for Out of Box Experience. The first run setup wizard that runs on new devices when first powered on.
VoIP
Voice over IP - Phone systems that are based over network/internet connections instead of traditional phone lines.