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Tidal locking is a phenomenon that occurs when an astronomical body, such as a moon or a planet, rotates on its axis in such a way that the same side always faces the body it is orbiting. This happens due to gravitational interactions between the two bodies, which create tidal forces that distort their shapes. In the case of a tidally locked moon, its orbital period around the planet matches its rotation period.

Tidal shock refers to the phenomenon that occurs when the gravitational pull of the moon (and to a lesser extent, the sun) causes significant changes in water levels, resulting in rapid fluctuations in tides. This can lead to dramatic shifts in aquatic environments, affecting habitats and the organisms that live there. In a broader context, "tidal shock" can also refer to the stress placed on marine organisms due to rapid changes in environmental conditions, which can be caused by tidal forces.