Whey proteins are of three types – concentrate, isolate and hydrolysate. If you consume concentrate, then it will be around 60-70% protein and remaining fats/carbs. If you go with isolate or hydrolysate, then you will consume more pure protein. Hydrolysate is easy to digest and absorb into the body. Other forms of proteins are pea protein, rice protein, quinoa protein, plant-based protein, etc.