Question

What is parallel universe​

Answer 1

Answer:

Parallel universe, also known as a parallel dimension, alternate universe, or alternate reality, is a hypothetical self-contained plane of existence, co-existing with one's own. The sum of all potential parallel universes that constitute reality is often called a "multiverse".

Answer 2

Answer:

(in quantum mechanics) a universe theorized as existing alongside our own, although undetectable.

(in fantasy or science fiction) a world conceived of as coexisting with and having certain similiarities to the known world but different from it in some fundamental way.