To maintain and define your muscle mass or get ripped after intense bodybuilding sessions, you have to replace the carbohydrates with protein. To help your body get used to this change, protein shakes are the ideal solution.
Protein shakes have benefits for every sportsman and woman in a hurry: no need to prepare five meals a day, one or two of these meals can be replaced by a shake. To take with you everywhere in a Domyos shaker, for example!
Whey protein is used to supplement the diet and should not substitute a meal. The key factor for improving your bodybuilding is the nutrition, not the products!