We have high and low tides along the coasts and oceans of the world.
Both moon and sun exert their gravitational force on earth and on its water.
Moon's gravity is the main factor that influences the tides because moon is much closer to earth than the sun.
The side of the earth that is facing the moon experiences a stronger gravitational force than the other side of earth.
This difference in gravity creates a force that stretches earth and its water along the line to the centre of earth and moon.
This force is called tidal force and responsible for the high and low tides of water on ocean.
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