The Xenoverse contains multiple Metaverse's which forms cyberspace type Universe or Multi-Universes which a Single Xenoverse is a cyberspace version of a Multiverse and a collection of Xenoverses are Multiple Multiverses. It is also where the internet goes after data is being lost. Its size can be up to 10^1000^1001 light years.

In Short...

The Xenoverse is a 6-dimensional virtual-reality space that is the set of an incredibly large number of metaverses. When data is lost on the Internet or the Metaverse, it ends up in The Xenoverse.

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