What is the difference between Mealy and Moore state machines?

In a Moore machine, outputs depend only on the current state, so outputs change synchronously with state transitions and are stable throughout the state. In a Mealy machine, outputs depend on both current state and inputs, allowing outputs to change asynchronously within a state when inputs change. Moore machines typically require more states but have simpler output logic and more predictable timing. Mealy machines can respond faster to inputs with fewer states but may have glitchy outputs requiring output registers.