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Use only as a noun, as in user interface and application programming interface. Use interface by itself only if the context is clear.
For a general audience, it's OK to use UI or API after spelling out on the first mention. For a technical audience, it's not necessary to spell out those terms on the first mention.
Don't use interface as a verb. Use interact or communicate instead.
Examples
The familiar interface helps to minimize training requirements.
With Skype for Business, you can communicate with your team from wherever you are.