The Virtual Space is a plane between dimensions inhabited solely by sentient and non-sentient digital entities, and is where Vox resided prior to the events of CC.
The Virtual Space is technically accessible via non-digital entities, but so few civilisations have the technology to do this that it is almost exclusively accessible by god-like entities, such as Null.
This plane acts in a similar way to the 2-dimensional plane and so forth, in that things can be created in this plane by entities outside of it, but compared to the 3rd dimension, everything appears and acts very differently, in a way that makes it seem like it has its own laws of physics. It also exists on the same level as the spiritual and telepathic planes.