Novelty theory is an idea that explains why people like to do new and exciting things. It says that new things are attractive to us because they give us a feeling of excitement and surprise. When we experiment with something new, our brains light up because it's an interesting and challenging experience. Doing new things can give us a feeling of accomplishment and reward, which is why it's so enjoyable. The novelty theory explains why people enjoy trying new things - it's the promise of the unknown that makes it so exciting.