Multiverse Theory suggests that our universe is just one of many universes that exist simultaneously. Each universe may have different physical laws, constants, and even different versions of reality. This idea arises from various scientific theories, including quantum mechanics and cosmic inflation, which propose that multiple outcomes can occur in different universes. In the multiverse, every possible event could happen in some universe, leading to an infinite variety of realities. For example, there might be a universe where dinosaurs never went extinct or one where Albert Einstein never developed the theory of relativity. This concept challenges our understanding of existence and reality itself.