A Psionic simulation deck is a type of room commonly found on Protoss space vessels and training structures. The room is mainly used for recreation and research purposes. Through the use of holographic technology, the simulation deck can replicate virtually anything within certain parameters (Star Trek: Holodeck). For research purposes, most scientists and technicians use simulations to test out new technologies and weapons. Due to lack of resources, this has greatly helped nomadic fleets survive on what little they have.