With her arm raised, hand barely twinkling and trying to make it taller than usual, Annie answered the first question. "Transfiguration," she sighed trying to take some breath in order to complete her sentence, "...is the art of changing the form of objects, their appearance, and why not, disappear them..." She ended and took her hand down. It was not a very original answer, but it was a definition you seriously had to know since you were first introduced into magic, right?