A multiverse is a theoretical concept suggesting that there are multiple, possibly infinite, universes existing alongside our own. Each universe may have different physical laws, constants, and even dimensions, leading to a variety of realities. This idea arises from interpretations of quantum mechanics and cosmology, where different outcomes can create separate universes. In popular culture, multiverses are often depicted in science fiction and fantasy, showcasing alternate versions of characters or events. For example, in comic books, heroes may encounter different versions of themselves or alternate timelines. While the multiverse remains a speculative idea, it has sparked interest in both scientific and creative fields.