Based on the machine-learning algorithm baked into Android Wear, Smart Reply analyses the contents of an incoming email to offer basic responses.

If you receive a message, for example, asking if you're free for lunch on Tuesday, the suggested replies could be: "Yes," "No," and "Unfortunately, I'm not. How about Wednesday?"

Smart Reply learns over time

Google says Smart Reply learns over time and adapts to your vocabulary — so the more you use it, the better (and more personalized) the responses will be.