Here's why:

* The Moon's Gravity is the Primary Driver: The Moon's gravitational pull on Earth's oceans is the primary cause of tides. It's much stronger than the Sun's pull because the Moon is much closer to Earth.

* The Sun's Influence: The Sun does exert a gravitational pull on Earth's oceans, but it's weaker than the Moon's. However, the Sun's influence is not entirely negligible. It contributes to the height of the tides during spring tides (when the Sun, Moon, and Earth are aligned) and neap tides (when the Sun, Moon, and Earth form a right angle).

* Cancellation is Not the Primary Mechanism: While the gravitational forces of the Sun and Moon do interact, they don't fully "cancel each other out." Instead, they work together to create a more complex pattern of tides.

In summary:

* The Moon's gravity is the main driver of tides.

* The Sun's gravity plays a secondary role, affecting the height of tides.

* Tides are not caused by a complete cancellation of the Sun and Moon's gravitational forces.

Let me know if you have any other questions!