We see the moon on Earth because light from the sun bounces off of it and reflects to our surface.
The rotation of the earth causes the moon to appear to move through our sky in an arching pattern.
The revolution of the moon along its 27 day orbit around the earth (while it slowly rotates on its own axis) causes light to hit different portions of the moon, creating its changing face.
The moon’s orbit causes tides on earth, provides us with