A multiverse is a hypothetical set of all possible real—life parallel universes.
According to the hypothesis, the universe in which we live may not be the only one that exists. In fact, there are an infinite number of universes, and they are all combined into a multiverse
This concept may seem a little crazy, but if it is true, then there is an alternative world exactly like the one we live in. Despite the fact that physicists claim that the multiverse is just a fiction, some scientists are trying to prove it. Even Stephen Hawking tried to solve her paradox.