A multiverse is a group of multiple universes and/or multiple sub-multiverses, which can either exist as an abstractly-defined concept or exist as a physical structure in the Omniverse. Universes are often grouped together by their relationship to each other, either because they all share something in common, people are traveling between these universes, or because they exist within some contiguous space.
The concept of multiverses can be divided into two major subclasses: logical multiverses and physical multiverses.
(Physical multiverses)
Physical multiverses are groups of universes that are physically connected in some way. Thus, inhabitants of these multiverses can travel between it.
(Multiversal clusters)
A Venn diagram illustrating the concept of multiversal clusters and their overlap.
Multiversal clusters, a major subclass of physical multiverses, are the largest subunit within the Omniverse. They are more specifically divided into two types: general clusters and local clusters.
Local clusters are contained within general clusters, and do not have well-defined boundaries and can overlap with many other local clusters in a way that suggests the Omniverse is more than three-dimensional. They are formed from similar universes clustering together, so they can be defined as a group of universes that share common traits; physical properties found within the universes, common species such as humans found in these universes, similar planets and cultures, or similar events.
General clusters encompass many local clusters, and tend to have well-defined boundaries and will strongly define the physical properties of the local clusters they contain, as well as defining their own physical properties, particularly concerning the structure of universes and the structure of the space between universes, defining how the universes themselves are connected to each other. They do not quite overlap as much as local clusters do, but they are often contained within a few larger general clusters.
(Exoverses)
Exoverses, the most common type of physical multiverses, are multiverses most similar to universes in the sense that, like a typical universe contains multiple galaxies within a tranversable space, an exoverse contains multiple universes and possibly other exoverses within a tranversable space. They often contain a finite number of universes, and the universes are often unique within the exoverse.
Another similarity to universes is the fact that exoverses can contain physical objects and even lifeforms within their "space between universes". In fact, an exoverse may even be a normal universe, except for the fact that it itself contains other universes. There have been many cases within the Omniverse of universes essentially turning into exoverses.
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