What is the difference between “self-serve” and “attended”?

In a self-service venue, the customer simply goes to the machine and makes his or her own beverage. This concept works well in cafeterias, offices, bakeries, club rooms, etc., and eliminates the need for a trained barista. The attended version has an option for steaming milk manually, as well as making beverages at the touch of a button. Attended versions work well in venues where alternate milk choices are required (soy, chai etc.) or where drinks are being prepared constantly throughout the day.