The existing universe is, in fact, the real world as perceived and understood by humanity so far — the realm we presently refer to as the cosmos.
The cosmos encompasses the totality of time, space, matter, and energy, including all galaxies, as well as dark matter and dark energy.
This universe contains all naturally intelligent and wise beings, such as humans, and potentially quasi-human entities that may exist on other planets orbiting other stars across the galaxies of the cosmos.
It also includes all artificially intelligent and wise entities that have come into existence.