What is computer interfacing?

Answer 1

An interface helps in interacting one thing with another. Computer interfacing is the interaction between two systems. The interaction between a computer and another entity is called computer interfacings like the interaction between a computer and a printer, a network, or a human user.

Answer 2

In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these.

Basically, it is a way for the average user to communicate with the computer without having to really understand all the workings inside. You don't have to be able to code to use a computer. Interfacing is an example of abstraction.