The term "Multiverse" refers to the concept that there may be multiple, possibly infinite, universes existing alongside our own. Each universe in the multiverse can have different physical laws, constants, and dimensions, leading to a variety of possible realities. This idea is often explored in science fiction and fantasy literature, as well as in theoretical physics. In cosmology, the multiverse theory arises from interpretations of quantum mechanics and the Big Bang theory. Some scientists propose that our universe is just one bubble in a vast sea of universes, each with its own unique properties. This concept challenges our understanding of reality and raises questions about the nature of existence itself.