What Causes ‘Tides’ and How Are They Predicted?

Imagine the ocean as a big bowl of water, and the moon is like a giant magnet in the sky. When the moon pulls on the water, it makes the ocean rise, that's a high tide! When the moon moves away, the water goes down, that's a low tide. The sun also helps pull the tides, but the moon has the strongest pull because it's closer to Earth.