During the new moon phase, the sun and the earth are on opposite sides of moon, and the moon is not visible from earth, since all of the sunlight is hitting the side we can't see from where we are.
Now, you, like me, might be wondering right now about the so-called dark side of the moon. Well, there isn't really a permanent dark side, just a side that isn't getting any exposure to the sun right now. And yes, due to tidal locking, we'll never see that hemisphere from the earth, which is amazing. Read more!