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Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

VTT (Virtual Tabletop) refers to digital platforms and tools that allow players to engage in tabletop roleplaying games online. These platforms provide a virtual space where players can interact with shared maps, tokens, and other game assets, simulating the experience of playing around a physical table. VTT tools often include features such as real-time dice rolling, character sheet management, and built-in audio/video communication, enabling players to connect and play together remotely.