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I'm no expert, but I'll give it a go. On the quantum level, every interaction has a certain probability to do this, or do that instead.
According to some theories, whenever this occurs, the entire universe forks, one in which this happened, and one in which that happened. This multitude of universes is the multiverse. We live on an ever-forking path which is our reality; many others exist, some quite similar due to forking recently, some very different due to forking long ago.