Void, also called the Void at the End of Time, is actually a dimension inhabited by Alioth, a monstrous cloud-like entity, and that contains the stays of various timelines which have been reset with the TVA. Additionally it is wherever those that are "pruned" are despatched, with various Loki https://jinnahq566mjv4.wikibriefing.com/1116547/detailed_notes_on_clint_winters