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It's more that [...] there are two different populations, the wizarding world and the muggle world.
Transfiguration is changing one thing into another. Defense Against the Dark Arts is - well, fighting dark wizards and not dying. Although I did end up dying eventually, oops Charms are - well, there's a charm for all sorts of things. Cheering up, changing colors, levitating, locking and unlocking... the list goes on. There's also working with magical plants and animals, making potions, and flying on brooms.