A multiverse or meta-universe is the hypothetical set of multiple possible universes, including the observable universe, which comprise the whole of physical reality. ...
The most common use of paralleluniverses in science fiction, when the concept is central to the story, is as a backdrop and/or consequence of time travel.
Paralleluniverses in modern comics have become particularly rich and complex, in large part due to the continual problem of continuity faced by the major two publishers, Marvel Comics and DC Comics.
Fredric Brown's "What Mad Universe" recounts the adventures of a science-fiction editor of the late 1940s who is thrown into a paralleluniverse that reflects the fantasies of his most annoying letter-to-the-editor writer (an adolescent male, naturally).
A paralleluniverse, also sometimes called an alternate universe, is a hypothetical universe which exists separately from our own.
Of the theories of paralleluniverses taken most seriously by modern physicists is the many worlds interpretation of quantum mechanics, proposed by Hugh Everett III in 1956, or some minor modification of it.
Concepts related to the idea of paralleluniverses in physics exist in philosophy and theology, usually referred to as "possible worlds".
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