A quantum superposition is a state in which a quantum system exists in multiple states at the same time. It's like being in two places at once, but not really.
Imagine you're on a bus. You think you're going to New York. But, in actuality, you're also simultaneously going to Paris, and simultaneously not going anywhere, and simultaneously stuck in a never-ending loop of uncertainty.
Read more about the Uncertainty Principle and how it affects our daily lives.