Here's why:

* The moon doesn't produce its own light. It shines because sunlight reflects off its surface.

* The sun is incredibly bright. Even during the day, the moon's reflection is strong enough to be visible, especially when it's near the sun in the sky.

* The moon's phase matters. You're more likely to see the moon during the day when it's in a crescent or gibbous phase. During a full moon, it's visible all night and is also often visible during the day, especially close to sunrise or sunset.

So, even though the sun is shining brightly, the moon's reflection is still visible during the day!