If you refer to the user interface of a particular piece of computing software, you are talking about its presentation on screen and how easy it is to operate.
In computing and electronics, an interface is an electrical cricuit which links one machine, especially a computer, with another.
V-RECIP-ERG
(使)(与…)相互联系（或连接）
If one thing interfaces with another, or if two things interface, they have connections with each other. If you interface one thing with another, you connect the two things.