Cake
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    • Quite simply, it’s recommendations based on what you do rather than what you say you want.  For example, the most interesting thing I learned about Netflix’s recommender system is that it makes suggestions based on what you actually watch, not what you add to your queue: all those intellectually curious documentaries that have been sitting unwatched in your queue for six months won’t fool Netflix that what you really want is more comedy flicks.

      This is also described as explicit vs implicit ratings. Explicit means marking something as a 1-5 rating, clicking a like button, etc. Implicit ratings are deduced from monitoring people’s behavior. Illustration below from a quite helpful book on the subject: "Practical Recommender Systems"