The moon isn't actually "out" at night in the same way the sun is "out" during the day. The moon doesn't produce its own light. Instead, we see the moon because it reflects sunlight.

Here's a breakdown:

* Earth's rotation: The Earth spins on its axis, causing day and night.

* The moon's orbit: The moon orbits the Earth, taking about a month to complete one orbit.

* Sunlight reflection: The sun shines on the moon, and the moon's surface reflects some of that light back towards Earth.

* Visibility: We see the moon when the sun is below the horizon, and the side of the moon facing Earth is illuminated by the sun.

So, the reason we see the moon at night is because the sun is illuminating it, and our part of the Earth is facing away from the sun.

It's important to note that the moon is sometimes visible during the day, especially when it's close to a new moon and only a sliver of it is illuminated.