Can someone explain to me exactly what protein shakes do?

Coolguy708
i went to the mall tonight and bought a 4 pack of protein shakes the clerks at the store said to drink it after you work out but I don't know lol I'm kinda scared I never drank protein shakes before and I don't want to go messing my body up I'm skinny but with musle I started working out during the summer time and my body is starting to get bigger and that's why I bought this stuff because I wanna look bigger faster I work out everyday at school and at home should I drink this stuff or no some of my friends say you should only drink protein drinks if your body isn't getting enough protien but I think my body I'm not sure should I try it out anyway or go see my doctor first?
Can someone explain to me exactly what protein shakes do?
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