Tritheism is a belief that there are three Gods, instead of one. It's like when you think of a family, like a mom, a dad, and a kid - it's the same idea. Instead of saying that there is only one God, tritheism says that there are three Gods. These three Gods might have different roles or duties, and they might work together in some way. For example, one God might create things, another might help people, and the third might protect and provide guidance.