'user-end' originates from the combination of 'user' and 'end', where 'user' refers to the person using a system and 'end' signifies the part or aspect of the system.

The term 'user-end' evolved from the need to distinguish between the parts of a system that interact with users and those that do not.

Initially, it referred to any part of a system used by a person, but now it specifically denotes the interface or front-end.