It has been shown that periodically driven or Floquet systems can also be many-body localized under suitable drive conditions. This is remarkable because one generically expects a driven many-body system to simply heat up to a trivial infinite temperature state (the maximum entropy state without energy conservation). However, with MBL, this heating can be evaded and one can again get non-trivial quantum orders in the eigenstates of the Floquet unitary, which is the time-evolution operator for one period. The most striking example of this is the time-crystal, a phase with long-range spatiotemporal order and spontaneous breaking of time translation symmetry. This phase is disallowed in thermal equilibrium, but can be realized in a Floquet MBL setting.