An “interface” in the general sense is the area of contact or overlapping of two entities. An “interface” is the point at which different entities in the sense of objects, facts, systems or processes touch each other and thus show a commonality that enables a connection between the two.

In the description of systems, the term “interface” refers to the part of a system through which an exchange between systems or between a system and its environment can take place.
In the nomenclature of technical systems, the term “interface” is used to refer to the part of a system through which an exchange between the system on the one hand and other systems or users on the other hand can take place.

In the context of information and communication, an “interface” is the part of an information system through which the information contained in it can be accessed and modified.

An “interface” is therefore that part of an information system through which the information contained in it can be accessed from outside the system.

Interfaces of technical systems in the field of information and communication technologies are divided into several categories: User interfaces, software interfaces and hardware interfaces.