"Interface" typically refers to the way in which two or more systems, devices, or pieces of software connect and communicate with each other. It can also refer to the point at which two or more things meet and interact, or to a user interface, which is the part of a software program that a person interacts with. For example, you might say "I'm having trouble interfacing my laptop and my printer."

On the other hand, "interact" refers to the action of communicating or exchanging information between two or more things. It implies a more active, reciprocal exchange between the participants. For example, you might say "The students were asked to interact with each other to build their communication skills."

So in summary, "interface" refers to the means of connecting and communicating, while "interact" refers to the actual act of communication or exchange of information.