Universe or Multiverse?

The popular science outlets have been covering the possibility that our universe is just among a potentially infinite number of universes and the multiverse for year now, but in bits and pieces. Multiverse is a hypothetical group of multiple universe and the different universe within the multiverse are called parallel universe ,other universe, alternate universe or manyworld. Together,these universes comprise everything that exists the entirety of space , time, matter, energy, information and the physical laws and constants that describe them.
It's a compendium of 28 invited articles on every aspect of the multiverse field by the theoreticians and researchers who invented and are advancing this very active area. The realism some philosophers, such as David Lewis, believe that all possible world exist and that they are just as real as the world we live in. The very prominent and knowledgeable scientists and philosophers who discuss the reason that our universe has the very special characteristics that allow life and conscious observers to exist. Primarily they discuss this in terms of the anthropic principle.
The self consistency, it must have the characteristics which enable observers to evolve, thus eliminating the need for an infinity of universes without observers. The existence of the other universes to be tested?
The sure that all cosmologists accept that there are some regions of the universe that lie
beyond the reach of our telescope but somewhere on the slippery slope between that and the idea that there is an infinite number of universes. The multiverse theory may be dressed up in scientific language, but in essence it requires the same leap of faith.
The physics community has debated the various multiverse theories over time. Prominent physicists are divided about whether any other universes exist outside of our own. Some physicists say the multiverse is not a legitimate topic of scientific inquiry. Concerns have been raised about whether attempts to exempt the multiverse from experimental verification could erode public confidence in science and ultimately damage the study of fundamental physics. We cannot travel outside our universe, and it expands no faster than the speed of light. A multiverse is the concept that there are more than one universe . An omniverse is a set of all universe, thus the omniverse may only include our universe or if there is indeed a multiverse , it would include those ad well.