The World of Void is an isolated place outside of the multiverse with literally no time or space. As the name implies, it is a void world with infinite nothingness. The World of Void is the setting of the Tournament of Power, as the fighters can take advantage of the nothingness to use the full extent of their powers.
The Great Priest dubs the World of Void as the setting for the Tournament of Power. The Gods of Destruction, Angels, and Supreme Kais from every universe gather to spectate the matches of their fighters of their respective universes, along with the Great Priest, Zen-Oh, and Future Zen-Oh.