Here's why:

* Gravitational Pull: The moon's gravitational pull is the primary force that causes tides. Even though the moon is much smaller than the sun, it's much closer to Earth, so its gravitational influence on our planet is stronger.

* Bulges of Water: The moon's gravity pulls the water on the side of Earth facing the moon, creating a bulge. A corresponding bulge also occurs on the opposite side of Earth, due to inertia. These bulges are what we call high tides.

* Low Tides: The areas between the bulges experience low tides.

While the moon's influence on tides is undeniable, it's important to note that other factors, like the sun's gravity and Earth's rotation, also play a role. However, the moon's pull is the dominant force.