((Because i'm sure you don't want me writing a post with little to no point other than "SAm raised his hand" I'm going to god-mode you nodding, maybe barking "Get a move on" or something similar, so that we don't have to wait long for no answer. That's ok? I hope))
"Yeah, that's me," he said, smiling at the newcomer, a young hufflepuff girl, judging by the crest on her robes, and the happy look on her face. "Nice to meet you, i'm sorry you are?" He asked, grinning bashfully, as he didn't have a clue as to who he was talking to.
Then the Headma-... teacher started talking. Boy, he seemed like a prick, from his first thoughs, he did seem to know what he was talking about, but he was certainly a prick. Joy. One of those teachers.
Hearing the question, after an age of rambling, the type that teachers seemed to love spurting Sam put up his hand.
((Insert gruff reply here))
"Potions, sir, is the study of... well, potions, in basic terms. It's the study of how to make potions, different techniques, the way different ingredients and methods will react, the best way to make them, really," he said, pausing for a second before resuming. "On the other hand, it's also very focused on studying the effects of the potions themselves, what their effects, how they react when used with different substances, all that Jazz." He told them, "If you were asking what they are, Potions are liquids with magical properties that vary from potion to potion, some may help people, some could kill them, some enlarge, and some shrink them, it depends on the potion," he finished, nodding at the teacher, hoping he'd covered it effectively