Deer musk

Okay, so deer musk is a smelly stuff that comes from a deer's butt. It's called a gland and it's kind of like a stinky perfume that the deer makes to attract other deer. People used to use deer musk in perfumes and fragrances because it smells really strong and lasts a long time. But now people don't use it as much because it's not very nice to take something from the deer without their permission. Plus, there are other things that can make nice smells without having to take something from an animal. So, in short, deer musk is a strong smell that comes from a deer's butt and people used to use it in perfumes.