The ebb tide (or ebb current) is the tidal phase when water flows away from the shore toward the sea, causing water levels to fall. It's the outgoing portion of the tidal cycle, opposite of the flood tide (incoming flow).
Tides result from gravitational interactions between Earth, Moon, and Sun. The Moon's pull creates a water bulge on the near side; inertia creates a second bulge on the far side. As Earth rotates, locations experience two high and two low tides approximately every 24 hours and 50 minutes. Ebb tide occurs as a location rotates away from the Moon's direct influence, and water recedes toward the low-tide bulge.
Ebb tides expose intertidal zones, affecting navigation (shallower channels), marine life feeding patterns, and sediment transport. The term "ebb and flow" captures this rhythmic cycle—fundamental to coastal ecosystems and human maritime activities for millennia.