Too Long; Didn't Read
User activation and product adoption are terms that describe an action(or a series of actions) that a user takes after he completes the signup process within your app. Product adoption is when the user gets activated and starts using the app on a regular basis. Getting the user to that “aha moment” where he finds value in your application or service is what’s going to increase the chances of that user becoming a customer and adopter from the opposite side, not delivering that.