Simplify the following text for a Grade 11 native English-speaking person.
Original: Most places in the ocean usually experience two high tides and two low tides each day ( semidiurnal tide ) , but some locations experience only one high and one low tide each day ( diurnal tide ) .
Simplified: The strip of seashore that is under water at high tide and exposed at low tide , called the intertidal zone , is an important ecological product of ocean tides .