Iris was so very distracted. The classroom looked SO PRETTY. All white and sparkly and christmassy. The Head Girl LOVED Christmas. She had been one of the first people to come into the classroom, yet half of the students had offered their answer to the Professor's question before she even realised the lesson had started. Listening in to some of the younger students' answers, Iris figured out that they were telling Descoteaux what a Charm was. Raising her hand, the Head Girl decided to add her answer. "A charm is a spell that, generally has a positive use. They're used to make someone or something act in a way that they don't usually behave. However, they only affect the appearance and not the inherent nature of something... as that is what Transfiguration does. Some charms are really simple, and only affect a small area. An example of that are the tickling charm and the colour-change charm. But some charms are much more complex, such as the Muggle-repelling charm and the Fidelius Charm." Yeah... Iris liked to waffle. Lowering her hand, she went back to admiring all of the charm-work that went into making the classroom look like this.