Even though this was answered a while ago, here is more-or-less the same, but visualised.
Imagine two-dimensional beings. They live in 2D space, which we usually call a plane. There are infinitely many planes and some are parallel, i.e., they do not intersect. If you pick two of these, there is a space between those two planes (2D spaces), incomprehensible to 2D-beings:
Our beings here are 4D, so they can fathom the space between 3D spaces (for example, our and any other one parallel to it).
If we take the fourth dimension to be time, they can see and visit what you get between any two moments of our world (each moment being a 3D space, all of them parallel to each other), but I don't think that the movie went that deep.
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