There is only one "real" universe. If simulations are being run there's a potentially incomprehensible number of simulated universes. As a member of one of thos

There is only one "real" universe. If simulations are being run there's a potentially incomprehensible number of simulated universes. As a member of one of those universes, it is probable you are in one of the many simulations and not the only "real" universe.